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

Return flights

12 Oct - 16 Oct	Norwegian	direct
02 Oct - 09 Oct	Norwegian	direct
02 Oct - 16 Oct	Norwegian	direct
09 Oct - 16 Oct	Norwegian	direct
02 Oct - 12 Oct	Norwegian	direct
02 Oct - 19 Oct	Norwegian	direct
02 Oct - 05 Oct	Norwegian	direct
16 Oct - 19 Oct	Norwegian	direct
03 Oct - 05 Oct	Ryanair
09 Oct - 12 Oct	Norwegian	direct

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