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
12 Sep - 17 Sep	LOT
11 Sep - 17 Sep	LOT
09 Sep - 11 Sep	easyJet
15 Sep - 25 Sep	easyJet
27 Sep - 11 Oct	easyJet
09 Sep - 16 Sep	easyJet
22 Sep - 29 Sep	easyJet
26 Sep - 03 Oct	easyJet
23 Sep - 30 Sep	easyJet
30 Sep - 05 Oct	LOT
30 Sep - 07 Oct	easyJet
25 Sep - 30 Sep	Scandinavian Airlines
20 Sep - 28 Sep	SWISS
15 Sep - 20 Sep	Vueling Airlines
28 Sep - 12 Oct	easyJet
30 Sep - 07 Oct	SWISS	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 219€

Return flights