Oslo International Airport - Gardermoen (OSL)
Oslo International Airport (OSL), known as Gardermoen, is approximately 20 miles southeast of the city center. Right in its middle of it is the Flytoget train, which can speed groups into the middle of Oslo in 20 minutes and for far, far, far less than can a taxi. It runs nearly all the time. Flights from everywhere come into Gardermoen, and there are particularly painless connections from New York City's JFK and Chicago's O'Hare.