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

Return flights

11 Sep - 18 Sep	KLM
23 Sep - 28 Sep	Scandinavian Airlines
25 Sep - 28 Sep	Scandinavian Airlines
14 Sep - 18 Sep	KLM
18 Sep - 21 Sep	Scandinavian Airlines
24 Sep - 27 Sep	easyJet
16 Sep - 21 Sep	Scandinavian Airlines
22 Sep - 02 Oct	easyJet
22 Sep - 01 Oct	easyJet
18 Sep - 22 Sep	Scandinavian Airlines
10 Sep - 17 Sep	KLM
27 Sep - 28 Sep	easyJet
21 Sep - 01 Oct	LOT
21 Sep - 02 Oct	KLM
20 Sep - 04 Oct	easyJet

Also check the deals for one-way flights from Geneva 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 Geneva to Keflavik in September from 195€

Return flights