Cheapest one-way flights from Keflavik to Madrid in September from $111

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

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

One-Way flights

24 Sep Fly Play
23 Sep Fly Play
30 Sep Fly Play
10 Sep Fly Play
20 Sep Fly Play
21 Sep Scandinavian Airlines
15 Sep Scandinavian Airlines
03 Sep easyJet
04 Sep Scandinavian Airlines
10 Sep Fly Play direct

Also check the deals for return flights from Keflavik to Madrid 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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