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

Return flights

02 Oct - 05 Oct	Wizz Air Malta
01 Oct - 05 Oct	Wizz Air Malta
21 Oct - 28 Oct	easyJet
14 Oct - 26 Oct	easyJet
12 Oct - 17 Oct	Wizz Air Malta
02 Oct - 09 Oct	Wizz Air Malta
22 Oct - 26 Oct	Iberia Express
25 Oct - 07 Nov	Iberia Express
14 Oct - 29 Oct	easyJet
22 Oct - 27 Oct	Iberia Express
01 Oct - 09 Oct	Wizz Air Malta
27 Oct - 07 Nov	Ryanair
25 Oct - 03 Nov	Iberia Express
29 Oct - 05 Nov	Wizz Air Malta
29 Oct - 11 Nov	Wizz Air Malta
25 Oct - 01 Nov	Iberia Express
22 Oct - 01 Nov	Iberia Express
31 Oct - 10 Nov	Fly Play	direct
21 Oct - 01 Nov	easyJet
22 Oct - 03 Nov	Fly Play	direct

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

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 October from 137€

Return flights