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

Return flights

03 Sep - 07 Sep	Wizz Air
25 Sep - 12 Oct	Norwegian	direct
04 Sep - 07 Sep	Norwegian	direct
04 Sep - 09 Sep	Norwegian
04 Sep - 11 Sep	Norwegian	direct
18 Sep - 18 Sep	Air Serbia
11 Sep - 18 Sep	Norwegian	direct
04 Sep - 18 Sep	Norwegian	direct
07 Sep - 11 Sep	Norwegian	direct
25 Sep - 16 Oct	Norwegian	direct
07 Sep - 18 Sep	Norwegian	direct
02 Sep - 04 Sep	airBaltic

Also check the deals for one-way flights from Sofia 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 Sofia to Oslo in September from $150

Return flights