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

Return flights

24 Aug - 01 Sep	Iberia
24 Aug - 03 Sep	Iberia
24 Aug - 13 Sep	Iberia
29 Aug - 05 Sep	Norwegian
26 Aug - 03 Sep	Iberia
24 Aug - 05 Sep	Iberia
25 Aug - 01 Sep	Iberia
24 Aug - 31 Aug	Iberia
26 Aug - 05 Sep	Iberia
18 Aug - 28 Aug	Wizz Air UK
18 Aug - 25 Aug	Wizz Air UK
28 Aug - 04 Sep	Iberia
18 Aug - 26 Aug	Wizz Air UK
31 Aug - 12 Sep	Iberia
26 Aug - 31 Aug	Iberia
18 Aug - 27 Aug	Wizz Air UK
18 Aug - 29 Aug	Wizz Air UK
22 Aug - 27 Aug	Wizz Air UK
24 Aug - 30 Aug	Iberia
19 Aug - 27 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 $290

Return flights