Cheapest return MAD–KEF flights, September

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

Return flights

05 Sep - 20 Sep Ryanair
23 Sep - 29 Sep Wizz Air Malta
09 Sep - 20 Sep Wizz Air Malta
12 Sep - 20 Sep Ryanair
26 Sep - 11 Oct Iberia Express
30 Sep - 06 Oct Wizz Air Malta
11 Sep - 20 Sep Ryanair
14 Sep - 20 Sep Wizz Air Malta
23 Sep - 03 Oct Wizz Air Malta
15 Sep - 20 Sep Ryanair
30 Sep - 04 Oct Wizz Air Malta
30 Sep - 07 Oct Wizz Air Malta
12 Sep - 15 Oct Ryanair
13 Sep - 20 Sep Wizz Air Malta
09 Sep - 22 Sep Ryanair
26 Sep - 27 Sep Iberia Express
26 Sep - 03 Oct Iberia Express
20 Sep - 01 Oct Wizz Air Malta
28 Sep - 05 Oct Wizz Air Malta
28 Sep - 11 Oct Wizz Air Malta

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

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