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

Return flights

09 Oct - 16 Oct	Norwegian	direct
12 Oct - 16 Oct	Norwegian	direct
19 Oct - 23 Oct	Norwegian	direct
05 Oct - 09 Oct	Norwegian	direct
18 Oct - 26 Oct	Ryanair
23 Oct - 26 Oct	Ryanair
05 Oct - 16 Oct	Norwegian	direct
09 Oct - 23 Oct	Norwegian	direct
12 Oct - 23 Oct	Norwegian	direct
19 Oct - 26 Oct	Norwegian
26 Oct - 16 Nov	Ryanair
28 Oct - 04 Nov	Wizz Air
29 Oct - 05 Nov	Ryanair

Also check the deals for one-way flights from Oslo to Sofia in October.

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 Oslo to Sofia in October from 94€

Return flights