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

Return flights

19 Oct - 23 Oct	Norwegian	direct
23 Oct - 29 Oct	Ryanair
26 Oct - 14 Nov	Ryanair
23 Oct - 27 Oct	Norwegian
16 Oct - 23 Oct	Ryanair
23 Oct - 28 Oct	Norwegian
16 Oct - 20 Oct	Ryanair
23 Oct - 26 Oct	Ryanair
19 Oct - 26 Oct	Ryanair
26 Oct - 15 Nov	Norwegian
16 Oct - 19 Oct	Ryanair
16 Oct - 16 Oct	Ryanair
31 Oct - 10 Nov	Air Serbia
31 Oct - 06 Nov	Air Serbia
26 Oct - 02 Nov	Ryanair
25 Oct - 14 Nov	Lufthansa
26 Oct - 01 Nov	Lufthansa

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 107€

Return flights