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

Return flights

06 Dec - 09 Dec	Wizz Air UK
05 Dec - 09 Dec	Wizz Air
02 Dec - 09 Dec	Pegasus Airlines
01 Dec - 08 Dec	Wizz Air UK
02 Dec - 05 Dec	Pegasus Airlines
05 Dec - 11 Dec	easyJet
01 Dec - 07 Dec	Wizz Air UK
05 Dec - 10 Dec	Wizz Air
06 Dec - 15 Dec	Wizz Air UK
11 Dec - 15 Dec	Pegasus Airlines
28 Dec - 04 Jan	Pegasus Airlines
26 Dec - 02 Jan	Wizz Air
27 Dec - 01 Jan	Pegasus Airlines
29 Dec - 01 Jan	Icelandair	direct
26 Dec - 04 Jan	Icelandair	direct
31 Dec - 04 Jan	Wizz Air UK
27 Dec - 03 Jan	Pegasus Airlines
30 Dec - 04 Jan	Pegasus Airlines

Also check the deals for one-way flights from Istanbul to Keflavik in December.

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 December from $212

Return flights