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

Return flights

01 Dec - 04 Dec	Wizz Air UK
05 Dec - 08 Dec	Wizz Air UK
19 Dec - 28 Dec	easyJet
08 Dec - 11 Dec	Wizz Air UK
05 Dec - 07 Dec	easyJet
15 Dec - 01 Jan	Wizz Air UK
26 Dec - 31 Dec	Wizz Air
18 Dec - 25 Dec	AJet
26 Dec - 01 Jan	Wizz Air UK
18 Dec - 04 Jan	British Airways
28 Dec - 01 Jan	Wizz Air
17 Dec - 24 Dec	Wizz Air
30 Dec - 05 Jan	Wizz Air UK
30 Dec - 03 Jan	Wizz Air UK
25 Dec - 31 Dec	LOT
08 Dec - 11 Dec	Icelandair	direct
15 Dec - 01 Jan	Icelandair	direct
26 Dec - 01 Jan	Icelandair	direct

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 169€

Return flights