Cheapest return flights from Madrid to Keflavik in September from $193

Best time to book flights for Madrid (MAD) to Keflavik (KEF) flights at AirHint

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

Return flights

17 Sep - 01 Oct easyJet
09 Sep - 17 Sep easyJet
10 Sep - 17 Sep easyJet
17 Sep - 24 Sep easyJet
24 Sep - 01 Oct Ryanair
23 Sep - 01 Oct easyJet
26 Sep - 10 Oct Fly Play direct
17 Sep - 23 Sep Ryanair
10 Sep - 23 Sep Ryanair
10 Sep - 20 Sep Ryanair
16 Sep - 24 Sep Ryanair
16 Sep - 01 Oct easyJet
05 Sep - 17 Sep easyJet
16 Sep - 23 Sep Ryanair
24 Sep - 04 Oct Ryanair
06 Sep - 10 Sep Ryanair
24 Sep - 10 Oct Fly Play direct
26 Sep - 08 Oct easyJet
24 Sep - 02 Oct Ryanair
26 Sep - 02 Oct easyJet

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

Skyscanner

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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