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

Return flights

18 Sep - 24 Sep	Pegasus Airlines
18 Sep - 21 Sep	Pegasus Airlines
27 Sep - 30 Sep	Pegasus Airlines
18 Sep - 22 Sep	Pegasus Airlines
11 Sep - 17 Sep	Pegasus Airlines
19 Sep - 21 Sep	Pegasus Airlines
22 Sep - 24 Sep	Pegasus Airlines
15 Sep - 21 Sep	AJet
20 Sep - 21 Sep	Pegasus Airlines
26 Sep - 30 Sep	Pegasus Airlines
25 Sep - 02 Oct	Pegasus Airlines
22 Sep - 02 Oct	Pegasus Airlines
29 Sep - 02 Oct	Pegasus Airlines
29 Sep - 06 Oct	Pegasus Airlines
18 Sep - 16 Oct	Pegasus Airlines
23 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 237€

Return flights