The cheapest flight to Oslo you can get by boooking just before departure.
The most popular airlines on the route Riga - Oslo: Finnair (AY), Norwegian Air Shuttle (DY).
The cheapest flights you can book on the route Riga Intl Airport (RIX) - Sandefjord Torp (TRF).
Direct flights last about 1h 35min.
Direct flights available 3 days a week - Monday, Saturday, Sunday.
Direct flights: Wizz Air (W6), Air Baltic (BT), Norwegian Air Shuttle (DY).