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

Return flights

23 Oct - 27 Oct	Wizz Air
09 Oct - 14 Oct	Wizz Air
08 Oct - 14 Oct	Wizz Air
16 Oct - 27 Oct	Wizz Air
24 Oct - 28 Oct	Ryanair
08 Oct - 16 Oct	Wizz Air
14 Oct - 19 Oct	Ryanair
11 Oct - 16 Oct	Wizz Air
13 Oct - 20 Oct	Wizz Air
09 Oct - 18 Oct	Wizz Air
27 Oct - 03 Nov	Wizz Air
26 Oct - 03 Nov	LOT
27 Oct - 02 Nov	Wizz Air
26 Oct - 02 Nov	Ryanair

Also check the deals for one-way flights from Sofia to Keflavik 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 Sofia to Keflavik in October from 153€

Return flights