AirHint found the following cheapest return flights from Madrid (MAD) to Keflavik (KEF) in September 2026 (see full year).

Return flights

28 Sep - 06 Oct	Wizz Air UK
22 Sep - 03 Oct	Wizz Air UK
29 Sep - 06 Oct	Wizz Air UK
28 Sep - 03 Oct	Wizz Air UK
28 Sep - 11 Oct	Wizz Air UK
30 Sep - 11 Oct	Wizz Air
16 Sep - 27 Sep	Wizz Air Malta
16 Sep - 24 Sep	Wizz Air Malta
28 Sep - 05 Oct	Wizz Air UK
29 Sep - 11 Oct	Wizz Air UK
30 Sep - 10 Oct	Wizz Air UK
26 Sep - 06 Oct	Wizz Air UK
08 Sep - 13 Sep	Wizz Air UK
15 Sep - 24 Sep	Iberia
18 Sep - 24 Sep	Transavia France
07 Sep - 16 Sep	easyJet
14 Sep - 24 Sep	Wizz Air Malta
05 Sep - 16 Sep	easyJet
02 Sep - 16 Sep	Transavia France
19 Sep - 27 Sep	Iberia Express

Also check the deals for one-way flights from Madrid 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 Madrid to Keflavik in September from 180€

Return flights