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

Return flights

13 Sep - 24 Sep	easyJet	direct
20 Sep - 24 Sep	easyJet	direct
23 Sep - 28 Sep	easyJet	direct
16 Sep - 21 Sep	easyJet	direct
20 Sep - 28 Sep	easyJet	direct
27 Sep - 01 Oct	easyJet	direct
30 Sep - 05 Oct	easyJet	direct
30 Sep - 08 Oct	easyJet	direct
13 Sep - 21 Sep	easyJet	direct
09 Sep - 17 Sep	easyJet	direct
16 Sep - 23 Sep	easyJet
27 Sep - 12 Oct	easyJet
27 Sep - 12 Oct	easyJet	direct
19 Sep - 24 Sep	Wizz Air
13 Sep - 23 Sep	easyJet
26 Sep - 05 Oct	easyJet
27 Sep - 04 Oct	easyJet
29 Sep - 06 Oct	Lufthansa

Also check the deals for one-way flights from Basel 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 Basel to Keflavik in September from 87€

Return flights