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

Return flights

29 Sep - 06 Oct	Scandinavian Airlines
02 Sep - 09 Sep	United
03 Sep - 12 Sep	Delta
08 Sep - 13 Sep	British Airways
04 Sep - 12 Sep	SWISS
08 Sep - 15 Sep	United
17 Sep - 24 Sep	United
14 Sep - 21 Sep	United
11 Sep - 18 Sep	United
26 Sep - 03 Oct	Scandinavian Airlines
05 Sep - 12 Sep	Scandinavian Airlines
20 Sep - 27 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 478€

Return flights