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

Return flights

24 Aug - 03 Sep	Norwegian
29 Aug - 13 Sep	Norwegian
29 Aug - 03 Sep	Norwegian
27 Aug - 03 Sep	Norwegian
25 Aug - 01 Sep	Scandinavian Airlines
18 Aug - 24 Aug	Wizz Air UK
22 Aug - 05 Sep	Air Europa
18 Aug - 25 Aug	Wizz Air UK
27 Aug - 09 Sep	Norwegian
18 Aug - 31 Aug	Wizz Air UK
29 Aug - 06 Sep	Norwegian
31 Aug - 05 Sep	Air Europa
24 Aug - 01 Sep	Norwegian
21 Aug - 31 Aug	Iberia Express
22 Aug - 31 Aug	Iberia Express
22 Aug - 27 Aug	Iberia Express
19 Aug - 26 Aug	Iberia Express
22 Aug - 29 Aug	Iberia Express
04 Aug - 11 Aug	Wizz Air UK
15 Aug - 20 Aug	Iberia

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