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

Return flights

01 Dec - 04 Dec	Pegasus Airlines
01 Dec - 06 Dec	Pegasus Airlines
06 Dec - 11 Dec	Pegasus Airlines
08 Dec - 11 Dec	Pegasus Airlines
08 Dec - 12 Dec	Pegasus Airlines
22 Dec - 01 Jan	Pegasus Airlines
06 Dec - 14 Dec	Pegasus Airlines
10 Dec - 15 Dec	Transavia France
23 Dec - 02 Jan	Pegasus Airlines
31 Dec - 04 Jan	AJet
30 Dec - 03 Jan	Pegasus Airlines
19 Dec - 27 Dec	Transavia France

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 $254

Return flights