Kansai International Airport (Japanese: 関西国際空港, romanized: Kansai Kokusai Kūkō), commonly known as Kankū (Japanese: 関空) (IATA: KIX, ICAO: RJBB), is the primary international airport in the Greater Osaka Area of Japan and the closest international airport to the cities of Osaka, Kyoto, and Kobe. It is located on an artificial island (Kankūjima (関空島)) in the middle of Osaka Bay off the Honshu shore, 38 km (24 mi) southwest of Ōsaka Station, located within three municipalities, including Izumisano (north), Sennan (south), and Tajiri (central), in Osaka Prefecture. The airport's first airport island covers approximately 510 hectares (1,260 acres) and the second covers approximately 545 hectares (1,347 acres), for a total of 1,055 hectares (2,607 acres).

Kansai opened on 4 September 1994 to relieve overcrowding at Osaka International Airport, also called Itami Airport, which is closer to Osaka. It consists of two terminals: Terminal 1 and Terminal 2. Terminal 1, designed by Italian architect Renzo Piano, is the longest airport terminal in the world with a length of 1.7 km (1+1⁄16 mi). The airport serves as an international hub for All Nippon Airways, Japan Airlines, and Nippon Cargo Airlines and as a hub for Peach, the first international low-cost carrier in Japan. It is also the North Pacific hub for the FedEx Express, which obtained its fifth-right under the 1998 U.S. and Japan air agreement and established the Hub in 2014.

In 2019, 31.9 million passengers used the airport, making it the third busiest in Japan. The freight volume was 802,162 tonnes total: 757,414 t international (18th in the world) and 44,748 t domestic. The 4,000 m × 60 m (13,120 ft × 200 ft) second runway was opened on 2 August 2007. As of June 2014, Kansai Airport has become an Asian hub, with 780 weekly flights to Asia and Australasia (including 119 freight), 59 weekly flights to Europe and the Middle East (5 freight), and 80 weekly flights to North America (42 freight).

In 2020, Kansai was ranked the tenth-best airport in the world by Skytrax and received its awards for Best Airport Staff in Asia, World's Best Airport Staff, and World's Best Airport for Baggage Delivery.

In the 1960s, when the Kansai region was rapidly losing trade to Tokyo, planners proposed a new airport near Kobe and Osaka. The city's original international airport, Itami Airport, located in the densely populated suburbs of Itami and Toyonaka, was surrounded by buildings; it could not be expanded, and many of its neighbours had filed complaints because of noise pollution problems.

After the protests surrounding New Tokyo International Airport (now Narita International Airport), which was built with expropriated land in a rural part of Chiba Prefecture, planners decided to build the airport offshore. The new airport was part of a number of new developments to revitalize Osaka, which had been losing economic and cultural ground to Tokyo for most of the century.

Initially, the airport was planned to be built near Kobe, but the city of Kobe refused the plan, so the airport was moved to a more southerly location on Osaka Bay. There it could be open 24 hours per day, unlike its predecessor in the city.

An artificial island, 4 km (2+1⁄2 mi) long and 2.5 km (1+1⁄2 mi) wide, was proposed. Engineers needed to overcome the extremely high risks of earthquakes and typhoons (with storm surges of up to 3 m or 10 ft). The water depth is 18 metres (59 ft) on top of 20 metres (66 ft) of soft Holocene clay which holds 70% water. A million sand drains were built into the clay to remove water and solidify the clay.

Construction started in 1987. The sea wall was finished in 1989 (made of rock and 48,000 tetrapods). Three mountains were excavated for 21 million cubic metres (27 million cubic yards), and 180 million cubic metres (240 million cubic yards) was used to construct island 1. Over three years, 10,000 workers using 80 ships took 10 million man-hours to complete the 30-or-40-metre (100 or 130 ft) layer of earth over the sea floor and inside the sea wall. In 1990, a three-kilometre (1.9 mi) bridge was completed to connect the island to the mainland at Rinku Town, at a cost of $1 billion. Completion of the artificial island increased the area of Osaka Prefecture just enough so that it is no longer the smallest prefecture in Japan (Kagawa Prefecture is now the smallest).

The bidding and construction of the airport was a source of international trade friction during the late 1980s and early 1990s. Prime Minister Yasuhiro Nakasone responded to American concerns, particularly from Senator Frank Murkowski, that bids would be rigged in Japanese companies' favour by providing special offices for prospective international contractors, which ultimately did little to ease the participation of foreign contractors in the bidding process. Later, foreign airlines complained that two-thirds of the departure hall counter space had been allocated to Japanese carriers, disproportionately to the actual carriage of passengers through the airport.

The island had been predicted to sink 5.7 m (18 ft 8 in) by the most optimistic estimate as the weight of the material used for construction compressed the seabed silts. However, by 1999, the island had sunk 8.2 m (26 ft 11 in) – almost 50% more than predicted. The project became the most expensive civil works project in modern history after twenty years of planning, three years of construction and US$15bn of investment. Much of what was learned went into the successful artificial islands in silt deposits for New Kitakyushu Airport, Kobe Airport, and Chubu Centrair International Airport. The lessons of Kansai Airport were also applied in the construction of Hong Kong International Airport.

In 1991, the terminal construction commenced. To compensate for the sinking of the island, adjustable columns were designed to support the terminal building. These are extended by inserting thick metal plates at their bases. Government officials proposed reducing the length of the terminal to cut costs, but architect Renzo Piano insisted on keeping the terminal at its full planned length. The airport was opened on 4 September 1994.

On 17 January 1995, Japan was struck by the Great Hanshin earthquake, the epicenter of which was about 20 km (12 mi) away from KIX and killed 6,434 people on Japan's main island of Honshū. Its earthquake engineering, particularly the use of sliding joints, allowed the airport to emerge unscathed. Even the glass in the windows remained intact. On 22 September 1998, the airport survived a typhoon with wind speeds over 60 m/s (130 mph).

On 19 April 2001, the airport was one of ten structures given the "Civil Engineering Monument of the Millennium" award by the American Society of Civil Engineers.

As of 2008, the total cost of Kansai Airport was $20 billion including land reclamation, two runways, terminals, and facilities. Most additional costs were initially due to the island's sinking, caused by the soft soils of Osaka Bay, which was anticipated by designers. The sink rate fell from 50 cm (20 in) per year during 1994 to 7 cm (3 in) per year in 2008.

Opened on 4 September 1994, the airport serves as a hub for several airlines such as All Nippon Airways, Japan Airlines, and Nippon Cargo Airlines. It is the international gateway for Japan's Kansai region, which contains the major cities of Kyoto, Kobe, and Osaka. Other Kansai domestic flights fly from the older but more conveniently located Osaka International Airport in Itami, or from the newer Kobe Airport.

The airport had been deeply in debt, losing $560 million in interest every year. Airlines had been kept away by high landing fees (about $7,500 for a Boeing 747), the second most expensive in the world after Narita's. In the early years of the airport's operation, excessive terminal rent and utility bills for on-site concessions also drove up operating costs: some estimates before opening held that a cup of coffee would have to cost US$10. Osaka business owners pressed the government to take a greater burden of the construction cost to keep the airport attractive to passengers and airlines.

On 17 February 2005, Chubu Centrair International Airport opened in Nagoya, just east of Osaka. The opening of the airport was expected to increase competition between Japan's international airports. Despite this, passenger totals were up 11% in 2005 over 2004, and international passengers increased to 3.06 million in 2006, up 10% over 2005. Adding to the competition were the opening of Kobe Airport, less than 25 km (16 mi) away, in 2006 and the lengthening of the runway at Tokushima Airport in Shikoku in 2007. The main rationale behind the expansions was to compete with Incheon International Airport and Hong Kong International Airport as a gateway to Asia, as Tokyo area airports were severely congested. Kansai saw a 5% year-on-year increase in international traffic in summer 2013, largely supported by low-cost carrier traffic to Taiwan and Southeast Asia overcoming a decrease in traffic to China and South Korea.

The airport authority was allotted four billion yen in government support for fiscal year 2013, and the Ministry of Land, Infrastructure, and Transport and the Ministry of Finance agreed to reduce this amount in stages through fiscal year 2015, although local governments in the Kansai region have pressed for continued subsidies.

Kansai has been marketed as an alternative to Narita Airport for international travelers from the Greater Tokyo Area. By flying to Kansai from Haneda Airport and connecting to international flights there, travelers can save the additional time required to get to Narita: up to one and a half hours for many residents of Kanagawa Prefecture and southern Tokyo.

The airport was at its limit during peak times, owing especially to freight flights, so a portion of Phase II expansion—the second runway—was made a priority. Thus, in 2003, believing that the sinking problem was almost over, the airport operators started to construct a 4,000 m (13,000 ft) second runway and terminal.

The second runway opened on 2 August 2007, but with the originally planned terminal portion postponed. This lowered the project cost to JPY¥910 billion (approx. US$8 billion), saving ¥650 billion from the first estimate. The additional runway development, which was opened in time for the IAAF World Athletics Championships in Osaka, has expanded the airport size to 10.5 square kilometres (2,600 acres). The second runway is used for landings and when there are incidents prohibiting takeoff from runway A. The new runway allowed the airport to start 24-hour operations in September 2007.

A new terminal building opened in late 2012. There are additional plans for several new aprons, a third runway (06C/24C) with a length of 3,500 m (11,483 ft), a new cargo terminal and expanding the airport size to 13 km (5 sq mi). However, the Japanese government has currently postponed these plans for economic reasons.

Since July 2008, Osaka Prefecture governor Toru Hashimoto has been a vocal critic of Itami Airport, arguing that the Chuo Shinkansen maglev line will make much of its domestic role irrelevant, and that its domestic functions should be transferred to Kansai Airport in conjunction with upgraded high-speed access to Kansai from central Osaka. In 2009, Hashimoto also publicly proposed moving the functions of Marine Corps Air Station Futenma to Kansai Airport as a possible solution for the political crisis surrounding the base.

In May 2011, the Diet of Japan passed legislation to form a new Kansai International Airport Corporation using the state's existing equity stake in Kansai Airport and its property holdings at Itami Airport. The move was aimed at offsetting Kansai Airport's debt burden.

The merger of the Itami and Kansai airport authorities was completed in July 2012. Shortly following the merger, Kansai Airport announced a 5% reduction in landing fees effective October 2012, with additional reductions during overnight hours when the airport is underutilized, and further discounts planned for the future, including subsidies for new airlines and routes. As of October 2012 these moves were intended to bring Kansai's fees closer to the level of Narita International Airport, where landing fees were around 20% lower than Kansai's, and to improve competitiveness with other Asian hubs such as Incheon International Airport in South Korea.

Since its formation, the new operating company has also made efforts toward international expansion, bidding for operating concessions at Yangon International Airport and Hanthawaddy International Airport in Myanmar.

KIAC conducted a public tender to sell the operating rights for Kansai and Itami Airport in May 2015. Orix and Vinci Airports were the sole bidders for the 45-year contract, at a price of around $18 billion. The new operating company, Kansai Airports, took over on 1 April 2016. It is 80% owned by Orix and Vinci, with the remaining 20% owned by Kansai-based enterprises such as Hankyu Hanshin Holdings and Panasonic.

On 4 September 2018, the airport was hit by Typhoon Jebi. The airport had to pause operations after seawater surges inundated the island; runways were hit, and the water reached up to the engines of some aircraft. The situation was further exacerbated when a large tanker crashed into the bridge that links the airport to the mainland, effectively stranding the people remaining at the airport. All flights at the airport were canceled until 6 September, at which date Prime Minister Shinzō Abe announced the airport would partially resume domestic operations.

Train services to the airport resumed from 18 September 2018 after repair works to the Kansai Airport Line and Nankai Airport Line were completed, and the airport resumed regular operations on 1 October 2018. Repairs to the damaged section of the Sky Gate Bridge R were finally completed on 8 April 2019, restoring traffic both to and from the mainland completely.

The main KIX passenger terminal, Terminal 1, is a single four-storey building designed by Renzo Piano Building Workshop (Renzo Piano and Noriaki Okabe), and has a gross floor space of 296,043 square metres (3,186,580 sq ft). As of 2018, at a total length of 1.7 km (1.1 mi) from end to end, Terminal 1 is the longest airport terminal in the world. It has a sophisticated people mover system called the Wing Shuttle, which moves passengers from one end of the pier to the other.

The terminal's roof is shaped like an airfoil. This shape is used to promote air circulation through the building: giant air conditioning ducts blow air upwards at one side of the terminal, circulate the air across the curvature of the ceiling, and collect the air through intakes at the other side. Mobiles are suspended in the ticketing hall to take advantage of the flowing air.

The ticketing hall overlooks the international departures concourse, and the two are separated by a glass partition. During Kansai's early days, visitors were known to throw objects over the partition to friends in the corridor below. The partition was eventually modified to halt this practice.

On 23 June 2017, at the terminal's promotion space, a game experience area known as "Nintendo Check In" opened. In this game experience area, guests arriving at Terminal 1 can play Nintendo Switch games free of charge. There is a statue of Mario at the experience area, along with Super Mario Cappy caps from Super Mario Odyssey for passengers to take photos with. There also Amiibo figurines on display there. In the northern and southern arrival routes of Terminal 1, there are decorations of Nintendo characters like Mario, Luigi, Princess Peach, and others welcoming arriving passengers.

Terminal 2 is a low-cost carrier (LCC) terminal designed to attract more LCCs by providing lower landing fees than Terminal 1. It is exclusively occupied by Peach, Spring Airlines, and Jeju Air. Other LCCs serving Kansai, such as Jetstar Airways, Jetstar Japan, and Cebu Pacific, use the main Terminal 1.

Peach requested that Terminal 2 have a simplified design in order to minimize operating costs. The terminal is a single-story building, thus eliminating the cost of elevators. Passageways to aircraft have no air conditioning. The terminal also has no jet bridges, having one boarding gate for domestic departures and one boarding gate for international departures. In case of rain, passengers are lent umbrellas to use as they walk to the aircraft.

Terminal 2 is not directly connected to Terminal 1 or to Kansai Airport Station. Free shuttle buses run between the two terminals, and between Terminal 2 and the railway and ferry stations. It is also possible to walk between the terminals through the KIX Sora Park, a four-hectare park located adjacent to Terminal 2.

Airlines	Destinations
Aero K	Cheongju
AirAsia X	Kuala Lumpur–International, Taipei–Taoyuan
Air Busan	Busan, Seoul–Incheon
Air Canada	Seasonal: Toronto–Pearson, Vancouver
Air China	Beijing–Capital, Hangzhou, Shanghai–Pudong
Air France	Paris–Charles de Gaulle
Air Macau	Macau
Air Seoul	Seoul–Incheon
All Nippon Airways	Beijing–Capital, Dalian, Ishigaki, Miyako, Naha, Qingdao, Sapporo–Chitose, Shanghai–Pudong, Tokyo–Haneda
ANA Wings	Naha, Sapporo–Chitose, Tokyo–Haneda Seasonal: Miyako
Asiana Airlines	Seoul–Gimpo, Seoul–Incheon Seasonal: Saipan
Batik Air Malaysia	Kuala Lumpur–International, Taipei–Taoyuan (both end 7 December 2024)
Beijing Capital Airlines	Hangzhou, Shijiazhuang
Cathay Pacific	Hong Kong, Taipei–Taoyuan
Cebu Pacific	Cebu, Manila
China Airlines	Kaohsiung, Taipei–Taoyuan
China Eastern Airlines	Beijing–Daxing, Hefei, Ningbo, Qingdao, Shanghai–Pudong, Wuhan
China Southern Airlines	Beijing–Daxing, Dalian, Guangzhou, Harbin, Shanghai–Pudong, Shenyang
Eastar Jet	Seoul–Incheon
Emirates	Dubai–International
Etihad Airways	Abu Dhabi
EVA Air	Kaohsiung, Taipei–Taoyuan
Finnair	Helsinki
Greater Bay Airlines	Hong Kong
Hainan Airlines	Beijing–Capital
Hawaiian Airlines	Honolulu
HK Express	Hong Kong
Hong Kong Airlines	Hong Kong
Japan Airlines	Bangkok–Suvarnabhumi, Honolulu, Los Angeles, Sapporo–Chitose, Shanghai–Pudong, Taipei–Taoyuan, Tokyo–Haneda
Japan Transocean Air	Ishigaki, Naha
Jeju Air	Busan, Seoul–Gimpo, Seoul–Incheon Seasonal: Muan
Jetstar	Brisbane, Cairns, Sydney
Jetstar Asia	Manila, Singapore
Jetstar Japan	Fukuoka, Kōchi-Ryoma, Kumamoto, Naha, Sapporo–Chitose, Shimojishima, Taipei–Taoyuan, Tokyo–Narita
Jin Air	Busan, Muan (begins 2 December 2024), Seoul–Incheon
Juneyao Air	Beijing–Daxing, Changsha, Changzhou, Harbin, Nanjing, Qingdao, Shanghai–Pudong, Wenzhou, Wuhan, Wuxi
KLM	Amsterdam
Korean Air	Seoul–Gimpo, Seoul–Incheon
Loong Air	Hangzhou
Lufthansa	Munich
Malaysia Airlines	Kuala Lumpur–International
MIAT Mongolian Airlines	Seasonal: Ulaanbaatar
Okay Airways	Changsha, Hangzhou, Linyi
Peach	Amami Oshima, Bangkok–Suvarnabhumi, Fukuoka, Hong Kong, Ishigaki, Kagoshima, Kaohsiung, Kushiro, Memanbetsu, Miyazaki, Nagasaki, Naha, Niigata, Sapporo–Chitose, Sendai, Seoul–Incheon, Shanghai–Pudong, Singapore (begins 4 December 2024), Taipei–Taoyuan, Tokyo–Narita
Philippine Airlines	Cebu (resumes 22 December 2024), Manila
Philippines AirAsia	Manila
Qatar Airways	Doha
Qingdao Airlines	Qingdao
Scoot	Singapore
Shandong Airlines	Jinan, Qingdao
Shanghai Airlines	Shanghai–Pudong
Shenzhen Airlines	Nanjing, Nantong, Shenzhen, Wuxi
Sichuan Airlines	Chengdu–Tianfu
Singapore Airlines	Singapore
Spring Airlines	Dalian, Guiyang, Ningbo, Shanghai–Pudong, Shenyang, Xi'an
StarFlyer	Tokyo–Haneda
Starlux Airlines	Taipei–Taoyuan
Thai AirAsia X	Bangkok–Don Mueang
Thai Airways International	Bangkok–Suvarnabhumi
Thai VietJet Air	Bangkok–Suvarnabhumi, Chiang Mai, Taipei–Taoyuan
Tianjin Airlines	Tianjin
Tigerair Taiwan	Kaohsiung, Taipei–Taoyuan
Turkish Airlines	Istanbul
T'way Air	Busan, Cheongju, Daegu, Jeju, Seoul–Incheon
United Airlines	Guam, San Francisco
VietJet Air	Hanoi, Ho Chi Minh City
Vietnam Airlines	Da Nang, Hanoi, Ho Chi Minh City
XiamenAir	Chongqing, Fuzhou, Hangzhou, Xiamen

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Airlines	Destinations
Air China Cargo	Beijing–Capital, Shanghai–Pudong
ANA Cargo	Bangkok–Suvarnabhumi, Dalian, Naha, Qingdao, Shanghai–Pudong, Tianjin, Tokyo–Narita
Asiana Cargo	Seoul–Incheon
Cargolux Italia	Hong Kong, Milan–Malpensa
Cathay Cargo	Hong Kong, Seoul–Incheon
Central Airlines	Yantai
China Airlines Cargo	Anchorage, Los Angeles, Taipei–Taoyuan
China Cargo Airlines	Shanghai–Pudong
China Postal Airlines	Dalian, Nanjing, Shanghai–Pudong, Shenzhen, Yiwu
DHL Aviation	Hong Kong
EVA Air Cargo	Anchorage, Atlanta, Taipei–Taoyuan
FedEx Express	Anchorage, Beijing–Capital, Guangzhou, Hong Kong, Indianapolis, Memphis, Oakland, Paris–Charles de Gaulle, Singapore, Shanghai–Pudong, Taipei–Taoyuan, Tokyo–Narita
Garuda Cargo	Jakarta–Soekarno-Hatta
Korean Air Cargo	Seoul–Incheon
Longhao Airlines	Hefei, Jinan, Ningbo, Shenzhen, Yantai, Zhengzhou
Lufthansa Cargo	Frankfurt, Krasnoyarsk, Seoul–Incheon
Qatar Airways Cargo	Doha, Hong Kong
SF Airlines	Changsha, Shenzhen, Wuhan
Sichuan Airlines Cargo	Nantong
Silk Way West Airlines	Baku, Seoul–Incheon
Suparna Airlines Cargo	Shanghai–Pudong
Tianjin Air Cargo	Yancheng
UPS Airlines	Anchorage, Louisville, Shanghai–Pudong, Shenzhen, Tokyo–Narita

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Kansai International Airport is connected only by the Sky Gate Bridge R, a combined road and railroad bridge, to Rinku Town and the mainland. The lower level of the bridge is used by two railroad operators: JR West and Nankai Electric Railway.

JR West operates the Haruka limited express train services from Kansai Airport Station to Tennōji, Ōsaka, Shin-Ōsaka, and Kyoto Station, with Kansai Airport Rapid [ja] services available from Kansai Airport Station to Ōsaka, Kyōbashi and several stations on the way. Connecting train service to Wakayama is available at Hineno Station. Various connections, such as buses, subways, trams, and other railroads, are available at each station.

Nankai operates the rapi:t, a limited express train service to Namba Station on the southern edge of downtown Osaka. Osaka Metro connections are available at Namba and Tengachaya Station.

Rail connections to and from Kansai Airport are expected to further improve access to and from Umeda with the opening of the Naniwasuji Line in 2031.

• 
  Kansai Airport Limited Express Haruka operated by JR West
• 
  Kansai Airport Rapid Service operated by JR West
• 
  Limited Express rapi:t operated by Nankai
• 
  Airport Express operated by Nankai

Kansai Airport Transportation Enterprise and other bus operators offer scheduled express bus services, called "Airport Limousines", for Kansai International Airport.

Two six storey parking structures, called P1 and P2, are located above a railroad terminal station, while the other two level parking facilities, called P3 and P4, are situated next to "Aeroplaza", a hotel complex.

The airport is only accessible from the Sky Gate Bridge R, a part of Kansai Airport Expressway. The expressway immediately connects to Hanshin Expressways Route 5, "Wangan Route", and Hanwa Expressway.

In July 2007, high-speed ferry service began. OM Kobe operates "Bay Shuttle" between Kobe Airport and KIX. The journey takes about thirty minutes.

• Kansai Airport Agency Company Building (航空会社北ビル, Kūkō Kaisha Kita Biru) – Houses the Kansai Airport Agency Co., Ltd. (株式会社 関西エアポートエージェンシー, Kabushiki Kaisha Kansai Eapōto Ējenshī)
• Kensetsu-to (建設棟, Kensetsu-tō)
  • The head office of the Kansai International Airport Land Development Co., Ltd. / KALD (関西国際空港用地造成株式会社, Kansai Kokusai Kūkō Yōchi Zōsei Kabushiki Kaisha) is on the fourth floor.
  • The Peach Aviation head office is on the fifth floor.
• Aeroplaza (エアロプラザ, Earopuraza) is located on the west side of Kansai Airport Station. It includes a hotel, restaurants, rental car counters, and other businesses
  • Hotel Nikko Kansai Airport (north portion of Kansai Airport)
  • Head office of Peach Aviation was previously located on the third floor (central portion of Kansai Airport)
• Central power station (KEPCO) energy center, 40 MW
• JAL Cargo import and export facilities (in southern portion)
• Japan Coast Guard Kansai airport Coast Guard air base
• Japan Coast Guard Special Security Team Base
• Osaka international post office (As of 2010 carrying about 19,000 tonnes per year of international postal matter)
• Oil tanker berths (three berths) and Fuel Supply center
• Airport access bridge ("The Sky Gate Bridge R"), which as of 2013 is the longest truss bridge in the world at 3,750 m (12,303 ft). The double-decker bridge consists of a lower deck devoted to rail, with the upper for road.

• Kansai Airports
• Itami Airport
• Santos Dumont Airport

• Hausler, E. and N. Sitar. "Performance of Soil Improvement Techniques in Earthquakes." (Archive) (Report in Progress) Pacific Earthquake Engineering Research Center, University of California Berkeley.

• Media related to Kansai International Airport (category) at Wikimedia Commons
• Kansai International Airport travel guide from Wikivoyage
• Official website
• History of KIX at Kansai Airports
• Kansai International Airport Land Co., Ltd.
• Kansai International Airport Project by Focchi Group