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

Return flights

29 Sep - 05 Oct	easyJet
30 Sep - 09 Oct	easyJet
16 Sep - 11 Oct	easyJet
16 Sep - 23 Sep	easyJet
16 Sep - 30 Sep	easyJet
24 Sep - 07 Oct	easyJet
24 Sep - 01 Oct	easyJet
24 Sep - 06 Oct	Eurowings
29 Sep - 12 Oct	easyJet
30 Sep - 12 Oct	easyJet
27 Sep - 07 Oct	easyJet
23 Sep - 28 Sep	easyJet
22 Sep - 25 Sep	easyJet
25 Sep - 02 Oct	Eurowings
13 Sep - 21 Sep	easyJet
14 Sep - 21 Sep	LOT
20 Sep - 27 Sep	easyJet
15 Sep - 23 Sep	Aer Lingus
12 Sep - 25 Sep	easyJet
17 Sep - 21 Sep	LOT

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 274€

Return flights