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

Return flights

23 Aug - 03 Sep	Scandinavian Airlines
29 Aug - 03 Sep	Norwegian
29 Aug - 09 Sep	Norwegian
29 Aug - 06 Sep	Norwegian
22 Aug - 31 Aug	LOT
23 Aug - 02 Sep	LOT
30 Aug - 10 Sep	Scandinavian Airlines
18 Aug - 31 Aug	Wizz Air UK
18 Aug - 24 Aug	Wizz Air UK
24 Aug - 05 Sep	Iberia
24 Aug - 31 Aug	Iberia
22 Aug - 03 Sep	Wizz Air UK
31 Aug - 09 Sep	Iberia
26 Aug - 06 Sep	Air Europa
19 Aug - 29 Aug	Iberia Express
17 Aug - 28 Aug	Iberia
17 Aug - 24 Aug	Iberia
21 Aug - 29 Aug	Iberia Express
17 Aug - 29 Aug	Iberia
21 Aug - 31 Aug	Iberia Express

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

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 August from 209€

Return flights