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

Return flights

26 Aug - 03 Sep	easyJet	direct
23 Aug - 03 Sep	easyJet	direct
30 Aug - 07 Sep	easyJet	direct
23 Aug - 27 Aug	easyJet	direct
30 Aug - 06 Sep	easyJet
26 Aug - 01 Sep	easyJet
23 Aug - 06 Sep	easyJet
23 Aug - 31 Aug	easyJet	direct
26 Aug - 31 Aug	easyJet	direct
16 Aug - 20 Aug	easyJet	direct
23 Aug - 30 Aug	easyJet
19 Aug - 27 Aug	easyJet	direct
16 Aug - 19 Aug	easyJet
22 Aug - 01 Sep	easyJet
16 Aug - 18 Aug	easyJet
25 Aug - 31 Aug	Wizz Air
05 Aug - 13 Aug	easyJet	direct

Also check the deals for one-way flights from Basel to Keflavik in August.

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 August from 167€

Return flights