The cheapest Oslo to San Francisco return flight on the radar right now is €549, flying with Scandinavian Airlines via one or more connections. It covers departures in January 2027, and every dated link below opens that exact OSL–SFO search on Skyscanner. The price we usually record on this route is €501. Across 104 recorded checks it has ranged between €457 and €858. Our sampling points to January 2027 as the cheapest month to fly Oslo to San Francisco.
Every fare here is re-confirmed against Skyscanner automatically, and each one is stamped with the moment it was last checked, so you can see how fresh it is instead of taking it on trust. Not flying from Oslo? We track 60 other departure cities for San Francisco, listed at the foot of this page.
Fares move quickly. If this Oslo to San Francisco price has gone by the time you search, shift the dates a day or two either side, because the same route is often still cheap just next door.