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

Return flights

12 Oct - 16 Oct	Wizz Air UK
03 Oct - 14 Oct	Wizz Air UK
01 Oct - 07 Oct	Wizz Air
12 Oct - 18 Oct	Wizz Air UK
27 Oct - 30 Oct	Wizz Air UK
07 Oct - 09 Oct	AJet
03 Oct - 09 Oct	Wizz Air UK
25 Oct - 28 Oct	AJet
25 Oct - 29 Oct	AJet
03 Oct - 08 Oct	Wizz Air UK
27 Oct - 03 Nov	Wizz Air UK
26 Oct - 03 Nov	Wizz Air UK
25 Oct - 03 Nov	Pegasus Airlines
25 Oct - 01 Nov	Wizz Air
24 Oct - 02 Nov	Pegasus Airlines
24 Oct - 02 Nov	Icelandair	direct

Also check the deals for one-way flights from Istanbul 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 Istanbul to Keflavik in October from $217

Return flights