Cheapest return flights from Istanbul to Keflavik in September from $248

Best time to book flights for Istanbul (IST) to Keflavik (KEF) flights at AirHint

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

Return flights

10 Sep - 16 Sep Norwegian
10 Sep - 17 Sep Norwegian
11 Sep - 17 Sep Aegean Airlines
27 Sep - 04 Oct Wizz Air UK
13 Sep - 21 Sep Wizz Air
20 Sep - 28 Sep Pegasus Airlines
23 Sep - 29 Sep Pegasus Airlines
16 Sep - 23 Sep Wizz Air UK
20 Sep - 25 Sep Wizz Air UK
21 Sep - 25 Sep Wizz Air UK
20 Sep - 29 Sep Wizz Air UK

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

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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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