Keflavík Airport (Icelandic: Keflavíkurflugvöllur [ˈcʰɛplaˌviːkʏrˌflʏɣˌvœtlʏr̥]) (IATA: KEF, ICAO: BIKF), also known as Reykjavík–Keflavík Airport, is the largest airport in Iceland and the country's main hub for international transportation. The airport located approximately 3 km (1.9 mi) west of the town of Keflavík, Reykjanesbær. and 50 km (30 mi) southwest of Reykjavík. The airport has two runways each measuring approx. 3,050 m (10,010 ft). Most international journeys to or from Iceland pass through this airport.

The main carrier at Keflavík is Icelandair, which has the airport as its main hub. The airport is also a hub for the airline Play. The airport is only used for international flights; all domestic flights use the much smaller Reykjavík Airport, which lies three kilometres (two miles) from Reykjavík's city centre. Keflavík Airport is operated by Isavia, a government enterprise.

Originally, the airport was built by the United States military during World War II, as a replacement for a small British landing strip at Garður to the north. It consisted of two separate two-runway airfields, built simultaneously just 4 km apart. Patterson Field in the south-east opened in 1942 despite being partly incomplete. It was named after a young pilot who died in Iceland. Meeks Field to the north-west opened on 23 March 1943, where the airport is still located today. It was named after another young pilot, George Meeks, who died on the Reykjavík airfield. Patterson Field was closed after the war, but Meeks Field and the adjoining structures were returned to Iceland's control and were renamed Naval Air Station Keflavik, named after the nearby town of Keflavík.

In 1949, a passenger terminal was built by the Lockheed Overseas Aircraft Service. The terminal serviced civilian passenger aviation at the airport. However, the passenger terminal was located within the military air base and found itself in the middle of a secure military zone. Travellers therefore had to pass through military checkpoints to reach their flights.

In 1951, the U.S. military returned to the airport under a defence agreement between Iceland and the U.S. signed on 5 May 1951.

The presence of foreign military forces in Iceland under the NATO-sponsored Iceland–U.S. Defense Agreement of 1951 was controversial in Iceland, which had no military forces other than the Icelandic Coast Guard. During the 1960s and 1970s, rallies were held to protest the U.S. military presence in Iceland (and in particular at Keflavík), and every year protesters walked the 50-kilometre (30 mi) road from Reykjavík to Keflavík and chanted "Ísland úr NATO, herinn burt" (literally: Iceland out of NATO, the military away). The protests were not effective.

The situation of having to pass through a U.S. military base in order to access the passenger terminal remained unchanged, but was not ideal. Subsequently, in April 1987 the Icelandic government finished construction of a relocated civilian terminal which was located on the north side of the airport. The new terminal had separate access from the military area and was accessible without passing through the military area. The new terminal was named after Leif Erikson who was the first European to arrive in North America (Flugstöð Leifs Eiríkssonar [is], "Leif Erikson Air Terminal").

The two 3,000-metre-long (10,000 ft) and 60-metre-wide (200 ft) runways were large enough to support NASA's Space Shuttle as well as the Antonov An-225. On 29 June 1999, Concorde G-BOAA flew from Heathrow Airport to Reykjavík (Keflavik airport). The Concorde had been there earlier. The airport is also an important emergency landing runway for large aircraft in transatlantic operation in the ETOPS system, which requires aircraft to always have less than a certain flight time to a suitable landing site.

The terminal was extended with the opening of the South Building in 2001, to comply with the requirements of the Schengen Agreement. The North Building was enlarged and finished in 2007. The United States military base closed down and was handed over to the Icelandic Government in 2006.

As of 2013, plans were proposed to add a third runway.

The airport was used as a hub by defunct airlines Iceland Express and WOW air until it ceased operations on 28 March 2019.

In 2016, the south terminal was expanded adding seven gates. The ramp area to the east of the airport was expanded in 2018, adding 13 remote stands. A new 1.2 km taxiway was constructed in 2023 by Isavia, which allows better aircraft traffic management at the airport. A major expansion of the airport began in 2022, with an eastern wing being constructed east of the main terminal. The first phase involved an opening an expanded arrivals hall in 2023, expanding the number of baggage carousels and the arrival retail area. As of 2024, it is projected that the rest of the eastern wing will be completed in 2025, adding 30% new terminal area compared to the current terminal, including four new jet-bridge gates, two new remote-stand bus gates and new spaces for retail units. As of 2024, a 1,900 square metre expansion of the south terminal is also under construction, on its east side.

The airport has a single terminal, originally called Leifsstöð. (named after Leif Erikson). A total of 13 jet-bridge gates and 17 remote stands are available. The terminal is split into A, C and D gates. A gates are located closest to the main lounge along the main hallway. C-gates are loctated past the main hallway on the upper level of the south building. D-gates are non-Schengen gates on the lower level of the south building. Airside, past airport security, one emerges into the Schengen side of the terminal. To access flights to non-Schengen countries (including the UK and United States), one must pass through passport control.

Although the population of Iceland is only about 400,000, there are scheduled flights to and from numerous locations across North America and Europe. The largest carrier operating out of Keflavik is Icelandair. The airline Play also uses Keflavik as a hub and is the second largest Icelandic carrier in 2024. The airport only handles international flights; domestic flights are operated from Reykjavík's domestic airport.

The following airlines operate regular scheduled and charter services to and from Keflavík:

Airlines	Destinations
Air Canada	Seasonal: Montréal–Trudeau, Toronto–Pearson
Air Greenland	Nuuk Seasonal: Billund (begins 18 March 2025)
airBaltic	Riga, Tallinn (begins 14 May 2025)
Atlantic Airways	Vágar
Austrian Airlines	Seasonal: Vienna
British Airways	London–Heathrow
Delta Air Lines	Seasonal: Detroit, Minneapolis/St. Paul, New York–JFK
Discover Airlines	Seasonal: Munich (begins 3 April 2025)
easyJet	Edinburgh, London–Luton, Manchester, Milan–Malpensa, Paris–Orly Seasonal: Birmingham (begins 3 December 2024), Bristol, London–Gatwick
Edelweiss Air	Zürich
Eurowings	Seasonal: Düsseldorf, Hamburg, Stuttgart
Finnair	Helsinki
Iberia Express	Seasonal: Madrid
Icelandair	Alicante, Amsterdam, Baltimore, Barcelona, Berlin, Boston, Brussels, Chicago–O'Hare, Copenhagen, Denver, Dublin, Frankfurt, Glasgow, Helsinki, Kulusuk, Lisbon, London–Gatwick, London–Heathrow, Manchester, Munich, Newark, New York–JFK, Nuuk, Orlando, Oslo, Paris–Charles de Gaulle, Prague, Raleigh/Durham, Rome–Fiumicino, Seattle/Tacoma, Stockholm–Arlanda, Tenerife–South, Toronto–Pearson, Vancouver, Washington–Dulles, Zürich Seasonal: Akureyri, Bergen, Billund, Detroit, Geneva, Gothenburg (resumes 19 June 2025), Gran Canaria, Halifax, Hamburg, Ilulissat, Innsbruck, Madrid, Milan–Malpensa, Minneapolis/St. Paul, Narsarsuaq, Nashville (begins 16 May 2025), Nice, Pittsburgh, Portland (OR), Salzburg, Vágar, Verona
Jet2.com	Seasonal: Belfast–International, Birmingham, Bristol, East Midlands, Edinburgh, Glasgow, Leeds/Bradford, Liverpool (begins 30 November 2025), London–Stansted, Manchester, Newcastle upon Tyne
Lufthansa	Frankfurt Seasonal: Munich
Neos	Seasonal: Alicante, Málaga, Tenerife–South, Verona
Norwegian Air Shuttle	Seasonal: Oslo
Play	Alicante, Amsterdam, Baltimore, Barcelona, Berlin, Boston, Copenhagen, Dublin, Hamilton (ON), Lisbon, London–Stansted, Madrid, Málaga, Newburgh, Paris–Charles de Gaulle, Tenerife–South, Washington–Dulles Seasonal: Aalborg (resumes 7 June 2025), Antalya (begins 15 April 2025), Athens, Billund, Bologna, Brussels, Cardiff, Düsseldorf, Faro (begins 12 April 2025), Fuerteventura, Funchal, Geneva, Gothenburg, Gran Canaria, Hamburg, Liverpool, Marrakesh, Palma de Mallorca, Porto, Prague, Pula (begins 31 May 2025), Salzburg, Split, Stockholm–Arlanda, Valencia (begins 24 May 2025), Verona, Vilnius, Warsaw–Chopin
Scandinavian Airlines	Copenhagen, Oslo
Transavia	Amsterdam, Paris–Orly
TUI Airways	Seasonal: Bristol, London–Gatwick, Manchester
United Airlines	Seasonal: Chicago–O'Hare, Newark
Vueling	Barcelona
WestJet	Seasonal: Calgary
Wizz Air	Budapest, Gdańsk, Katowice, Kraków, Milan–Malpensa, Rome–Fiumicino, Vienna, Warsaw–Chopin

^1 Icelandair's service between Akureyri and Keflavík is available only to connecting passengers flying with the airline internationally.

Airlines	Destinations
Icelandair Cargo	Boston, Liège, Los Angeles

Year	Passengers	Change
2004	1,883,725
2005	2,101,679	+11.6%
2006	2,272,917	+8.1%
2007	2,429,144	+6.9%
2008	2,193,434	-9.7%
2009	1,832,944	-16.4%
2010	2,065,188	+12.7%
2011	2,474,806	+19.8%
2012	2,764,026	+11.7%
2013	3,209,848	+16.1%
2014	3,867,425	+20.5%
2015	4,855,505	+25.5%
2016	6,821,358	+40.4%
2017	8,755,352	+28.3%
2018	9,804,388	+12.0%
2019	7,247,820	-26.08%
2020	1,373,971	-81.04%
2021	2,171,996	+58.1%
2022	6,126,421	+182.01%
2023	7,776,147	+26.9%

Busiest routes to/from Keflavík (2018)

Rank	Airport	Passengers	Operator(s)
1	Copenhagen	582,199	Icelandair, Play, SAS
2	London–Gatwick	467,032	easyJet, Icelandair, Norwegian, TUI Airways
3	Amsterdam	449,590	Icelandair, Transavia
4	Paris–Charles de Gaulle	443,312	Icelandair, Play
5	London–Heathrow	378,029	British Airways, Icelandair
6	Frankfurt	355,520	Icelandair, Lufthansa
7	Boston	330,792	Icelandair
8	Newark	327,046	Icelandair, United
9	New York–JFK	323,781	Delta, Icelandair
10	Oslo	313,713	Icelandair, Norwegian, SAS

The airport located approximately 3 km (1.9 mi) west of the town of Keflavík, Reykjanesbær, and 50 km (30 mi) southwest of Reykjavík. The airport is linked to downtown Reykjavik via a 50-kilometre (30 mi) journey on the Route 41 dual carriageway. There is a separated pedestrian and bike path form Keflavík Airport to the town of Keflavík, but not to Reykjavík. Long-term and short-term parking is available at the airport. Taxis are available outside the terminal. Rental cars are available from various companies.

Public buses are operated by Strætó bs on route 55 to Mjódd bus station (located in Reykjavík's suburbs); the public bus stop is not located outside the airport terminal itself, but is located a few hundred metres away, near the car rental area.

Private companies Flybus, Airport Express and others operate express services to Reykjavík, including stops and transfers to hotels.

• On 21 July 2013, a Russian Sukhoi Superjet 100 airliner, prototype aircraft 97005, made a belly landing during a test flight. The cause was a crew mistake due to fatigue. They operated the plane manually in order to simulate failures.

• On 28 April 2017, a Primera Air Boeing 737-800 skidded off an icy runway.

• On 7 February 2020, an Icelandair Boeing 757-200 suffered a collapsed right main landing gear during touchdown on runway 10.

• Official website
• KADECO
• The Icelandic Defence Agency