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

Return flights

22 Sep - 02 Oct	Pegasus Airlines
25 Sep - 28 Sep	Pegasus Airlines
27 Sep - 06 Oct	Pegasus Airlines
15 Sep - 30 Sep	Pegasus Airlines
20 Sep - 30 Sep	Pegasus Airlines
28 Sep - 06 Oct	AJet
29 Sep - 06 Oct	Pegasus Airlines
25 Sep - 02 Oct	Pegasus Airlines
18 Sep - 21 Sep	Pegasus Airlines
22 Sep - 27 Sep	AJet
08 Sep - 13 Sep	Pegasus Airlines
14 Sep - 21 Sep	Pegasus Airlines
10 Sep - 20 Sep	Pegasus Airlines
11 Sep - 21 Sep	Pegasus Airlines
11 Sep - 18 Sep	Pegasus Airlines
25 Sep - 04 Oct	Pegasus Airlines

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

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 September from $296

Return flights