Cheapest return flights from Madrid to Keflavik in September from $208

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

23 Sep - 01 Oct easyJet
17 Sep - 01 Oct easyJet
17 Sep - 24 Sep easyJet
16 Sep - 01 Oct easyJet
24 Sep - 01 Oct Ryanair
10 Sep - 30 Sep Ryanair
10 Sep - 17 Sep Ryanair
09 Sep - 24 Sep easyJet
17 Sep - 23 Sep Ryanair
17 Sep - 30 Sep Ryanair
03 Sep - 10 Sep easyJet
05 Sep - 12 Sep Fly Play direct
05 Sep - 10 Sep Fly Play direct
23 Sep - 30 Sep Iberia
22 Sep - 01 Oct Iberia
24 Sep - 08 Oct Ryanair
24 Sep - 08 Oct Fly Play direct
27 Sep - 06 Oct Iberia Express
24 Sep - 03 Oct Fly Play direct
19 Sep - 01 Oct Fly Play direct

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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