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

Return flights

29 Aug - 15 Sep	Norwegian
24 Aug - 03 Sep	Iberia
24 Aug - 01 Sep	Iberia
29 Aug - 08 Sep	Norwegian
25 Aug - 03 Sep	Wizz Air UK
21 Aug - 29 Aug	Iberia
31 Aug - 12 Sep	Iberia
26 Aug - 05 Sep	Iberia
29 Aug - 09 Sep	Norwegian
28 Aug - 06 Sep	Iberia
21 Aug - 31 Aug	Iberia
31 Aug - 07 Sep	Iberia
14 Aug - 20 Aug	Iberia
21 Aug - 27 Aug	Iberia
14 Aug - 22 Aug	Iberia
14 Aug - 18 Aug	Iberia
15 Aug - 22 Aug	Iberia
15 Aug - 29 Aug	Iberia
19 Aug - 29 Aug	Iberia
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 243€

Return flights