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

Return flights

30 Sep - 09 Oct	Wizz Air
20 Sep - 27 Sep	Wizz Air
20 Sep - 01 Oct	Wizz Air
03 Sep - 10 Sep	easyJet
07 Sep - 01 Oct	Wizz Air
19 Sep - 02 Oct	Neos Air
11 Sep - 16 Sep	easyJet
04 Sep - 20 Sep	Wizz Air
19 Sep - 01 Oct	Neos Air
22 Sep - 27 Sep	easyJet
26 Sep - 07 Oct	Fly Play
12 Sep - 16 Sep	Fly Play
01 Sep - 10 Sep	easyJet
26 Sep - 06 Oct	Fly Play
20 Sep - 29 Sep	Fly Play
01 Sep - 07 Sep	easyJet

Also check the deals for one-way flights from Keflavik to Athens 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 Keflavik to Athens in September from 228€

Return flights