AirHint found the following cheapest return flights from San Francisco (SFO) to Oslo (OSL) in September 2025 (see full year).

Return flights

30 Sep - 07 Oct	Scandinavian Airlines
09 Sep - 16 Sep	United
26 Sep - 30 Sep	SWISS
24 Sep - 01 Oct	Scandinavian Airlines
15 Sep - 22 Sep	United
03 Sep - 10 Sep	Scandinavian Airlines
27 Sep - 04 Oct	Scandinavian Airlines
21 Sep - 28 Sep	Scandinavian Airlines
18 Sep - 25 Sep	United
12 Sep - 19 Sep	United
06 Sep - 13 Sep	Scandinavian Airlines

Also check the deals for one-way flights from San Francisco to Oslo in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from San Francisco to Oslo in September from $546

Return flights