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

Return flights

27 Sep - 04 Oct	easyJet
16 Sep - 21 Sep	easyJet
28 Sep - 04 Oct	easyJet
24 Sep - 28 Sep	easyJet
24 Sep - 30 Sep	Wizz Air
13 Sep - 20 Sep	easyJet
14 Sep - 17 Sep	easyJet
14 Sep - 21 Sep	easyJet
18 Sep - 21 Sep	easyJet
25 Sep - 03 Oct	easyJet
15 Sep - 21 Sep	easyJet
10 Sep - 14 Sep	Volotea
30 Sep - 05 Oct	Lufthansa
16 Sep - 19 Sep	easyJet
15 Sep - 05 Oct	Lufthansa

Also check the deals for one-way flights from Lyon 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 Lyon to Keflavik in September from 240€

Return flights