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

Return flights

19 May - 30 May	Wizz Air UK
19 May - 22 May	Wizz Air UK
26 May - 28 May	Wizz Air UK
23 May - 28 May	Turkish Airlines
25 May - 28 May	Wizz Air UK
27 May - 28 May	Turkish Airlines
28 May - 28 May	Wizz Air UK
24 May - 28 May	Turkish Airlines
22 May - 28 May	Lufthansa

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

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 May from 259€

Return flights