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

Return flights

30 Sep - 09 Oct	easyJet
25 Sep - 03 Oct	LOT
15 Sep - 28 Sep	Vueling Airlines
13 Sep - 23 Sep	easyJet
01 Sep - 15 Sep	easyJet
06 Sep - 15 Sep	easyJet
08 Sep - 15 Sep	easyJet
22 Sep - 28 Sep	easyJet
21 Sep - 28 Sep	easyJet
21 Sep - 25 Sep	easyJet
27 Sep - 05 Oct	easyJet
15 Sep - 21 Sep	Vueling Airlines
19 Sep - 28 Sep	easyJet
23 Sep - 01 Oct	easyJet
27 Sep - 04 Oct	easyJet
25 Sep - 04 Oct	LOT
27 Sep - 04 Oct	Icelandair	direct

Also check the deals for one-way flights from Zurich 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 Zurich to Keflavik in September from $259

Return flights