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

Return flights

04 Mar - 09 Mar	easyJet
20 Mar - 29 Mar	Iberia
30 Mar - 10 Apr	Fly Play	direct
16 Mar - 29 Mar	Ryanair
17 Mar - 23 Mar	easyJet
16 Mar - 20 Mar	Fly Play	direct
16 Mar - 23 Mar	Fly Play	direct
18 Mar - 23 Mar	easyJet
17 Mar - 21 Mar	easyJet
16 Mar - 21 Mar	easyJet
17 Mar - 22 Mar	easyJet
27 Mar - 02 Apr	Iberia
28 Mar - 06 Apr	Iberia
30 Mar - 07 Apr	Iberia Express
27 Mar - 05 Apr	Iberia
26 Mar - 05 Apr	Iberia
23 Mar - 01 Apr	Iberia Express
31 Mar - 05 Apr	easyJet
29 Mar - 06 Apr	Iberia
27 Mar - 03 Apr	Fly Play	direct

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

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 March from $185

Return flights