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

Return flights

17 Sep - 23 Sep	Pegasus Airlines
17 Sep - 21 Sep	Pegasus Airlines
25 Sep - 02 Oct	Pegasus Airlines
19 Sep - 21 Sep	Pegasus Airlines
18 Sep - 24 Sep	Pegasus Airlines
23 Sep - 30 Sep	Pegasus Airlines
09 Sep - 16 Sep	Pegasus Airlines
23 Sep - 28 Sep	Pegasus Airlines
16 Sep - 18 Sep	Pegasus Airlines
24 Sep - 30 Sep	Pegasus Airlines
15 Sep - 24 Sep	Pegasus Airlines
09 Sep - 03 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 $275

Return flights