Cheapest return flights from Keflavik to Istanbul in September from $291

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

Return flights

21 Sep - 25 Sep LOT
24 Sep - 03 Oct easyJet
02 Sep - 17 Sep Wizz Air Malta
28 Sep - 07 Oct easyJet
24 Sep - 29 Sep easyJet
23 Sep - 29 Sep Fly Play
07 Sep - 22 Sep easyJet
21 Sep - 29 Sep easyJet
22 Sep - 29 Sep Scandinavian Airlines
24 Sep - 03 Oct Turkish Airlines direct
21 Sep - 25 Sep Turkish Airlines direct
24 Sep - 29 Sep Turkish Airlines direct
21 Sep - 29 Sep Turkish Airlines direct

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

Skyscanner

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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