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

Return flights

16 Aug - 20 Aug	Wizz Air
21 Aug - 26 Aug	Pegasus Airlines
16 Aug - 24 Aug	Wizz Air
26 Aug - 31 Aug	AJet
21 Aug - 24 Aug	Pegasus Airlines
25 Aug - 29 Aug	Pegasus Airlines
15 Aug - 24 Aug	Wizz Air UK
25 Aug - 01 Sep	AJet
30 Aug - 13 Sep	Wizz Air
20 Aug - 24 Aug	Turkish Airlines
06 Aug - 10 Aug	Pegasus Airlines
02 Aug - 14 Aug	Pegasus Airlines

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

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 August from 342€

Return flights