AirHint found the following cheapest return flights from Keflavik (KEF) to Istanbul (IST) in January 2026 (see full year).

Return flights

23 Jan - 10 Feb	Wizz Air Malta
29 Jan - 16 Feb	LOT
22 Jan - 09 Feb	LOT
30 Jan - 02 Feb	easyJet
14 Jan - 21 Jan	Wizz Air
30 Jan - 17 Feb	easyJet
15 Jan - 19 Jan	easyJet
08 Jan - 15 Jan	LOT
16 Jan - 19 Jan	Wizz Air Malta
09 Jan - 23 Jan	Wizz Air
02 Jan - 09 Jan	Wizz Air
29 Jan - 16 Feb	Icelandair	direct
03 Jan - 10 Jan	Wizz Air
22 Jan - 09 Feb	Icelandair	direct
15 Jan - 19 Jan	Icelandair	direct

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

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 Keflavik to Istanbul in January from $244

Return flights