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

Return flights

16 Sep - 22 Sep	Wizz Air UK
16 Sep - 17 Sep	easyJet
16 Sep - 18 Sep	easyJet
29 Sep - 07 Oct	Wizz Air Malta
17 Sep - 23 Sep	easyJet
26 Sep - 08 Oct	Pegasus Airlines
17 Sep - 21 Sep	easyJet
17 Sep - 24 Sep	easyJet
27 Sep - 05 Oct	SKY express
15 Sep - 22 Sep	Pegasus Airlines
16 Sep - 23 Sep	Wizz Air UK
23 Sep - 01 Oct	easyJet
20 Sep - 22 Sep	Wizz Air
16 Sep - 20 Sep	Wizz Air UK
30 Sep - 04 Oct	Ryanair
30 Sep - 14 Oct	Ryanair
26 Sep - 06 Oct	Wizz Air
27 Sep - 03 Oct	SKY express

Also check the deals for one-way flights from Athens 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 Athens to Keflavik in September from 273€

Return flights