Gardermoen combines an international hub role with the domestic backbone of a long, thinly populated country, so a large share of its movements are Norwegian internal flights that have no realistic ground alternative. The terminal is built around a single long pier structure with a widely used domestic and international split, and rail service is frequent enough that the 47 km distance rarely matters. Snow operations here are among the most professional in Europe, which is why Oslo keeps flying in conditions that would close airports further south.
Norway is not in the EU but is a full member of the European Economic Area, and Regulation (EC) 261/2004 applies there in the same way, so departures from Oslo are covered whatever the airline and arrivals are covered when operated by an EU or EEA carrier. Most Norwegian domestic and Scandinavian routes are under 1,500 km, which puts them in the €250 band even when the delay runs to six or seven hours. Norway also has a free, well-established complaints board for transport disputes, which issues opinions on EC 261 cases that airlines usually follow. Claims are generally subject to a three-year limitation period under Norwegian law.
On domestic Norwegian routes the practical remedy is often re-routing rather than money, since the distance caps compensation at €250 — but the airline still has to get you there and pay for meals and a hotel if you are held overnight. Widerøe's short regional flights use small aircraft, so a single cancellation can leave few seats for days; ask immediately about being sent via another airport rather than waiting for the same route. Keep the delay explanation in writing, because Norwegian carriers frequently cite weather at remote destinations, and the claim turns on whether that weather actually affected your flight.

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