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

Return flights

02 May - 09 May	Wizz Air UK
05 May - 09 May	Wizz Air UK
06 May - 09 May	Scandinavian Airlines
19 May - 26 May	Wizz Air UK
05 May - 27 May	Wizz Air UK
24 May - 26 May	Scandinavian Airlines
26 May - 29 May	Scandinavian Airlines
22 May - 30 May	Scandinavian Airlines
25 May - 30 May	Scandinavian Airlines
16 May - 30 May	Scandinavian Airlines

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 206€

Return flights