A new airport for Oslo, Norway, opened at Gardermoen, replacing a smaller one at the same location that had served as a backup to the city's previous main airport at Fornebu.

Oslo is the capital and most populous city of Norway. It constitutes both a county and a municipality. The municipality of Oslo had a population of 709,037 in 2022, while the city's greater urban area had a population of 1,064,235 in 2022, and the metropolitan area had an estimated population of 1,546,706 in 2021.

Oslo Airport — alternatively referred to as Oslo Gardermoen Airport or simply Gardermoen — is an international airport serving Oslo, the capital and most populous city of Norway. The airport is the second largest in Scandinavia and the Nordics. A hub for Scandinavian Airlines and an operating base for Norwegian Air Shuttle, Norse Atlantic Airways and Widerøe. In 2025, it is connected to 31 domestic and 164 international destinations.

Oslo Airport, Fornebu was the primary international airport serving Oslo and Eastern Norway from 1 June 1939 to 7 October 1998. It was then replaced by Oslo Airport, Gardermoen, and the area has since been redeveloped. The airport was located at Fornebu in Bærum, 8 km (5.0 mi) from the city center. Fornebu had two runways, one 2,370 m (7,780 ft) 06/24 and one 1,800 m (5,900 ft) 01/19, and a capacity of 20 aircraft. In 1996, the airport had 170,823 aircraft movements and handled 10,072,054 passengers. The airport served as a hub for Scandinavian Airlines System (SAS), Braathens SAFE and Widerøe. In 1996, they and 21 other airlines served 28 international destinations. Due to limited terminal and runway capacity, intercontinental and charter airlines used Gardermoen. The Royal Norwegian Air Force retained offices at Fornebu.