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

Return flights

29 Aug - 10 Sep	Norwegian
23 Aug - 31 Aug	LOT
29 Aug - 06 Sep	Norwegian
22 Aug - 30 Aug	LOT
23 Aug - 30 Aug	LOT
27 Aug - 04 Sep	LOT
25 Aug - 01 Sep	Iberia
19 Aug - 03 Sep	Iberia Express
17 Aug - 01 Sep	Iberia
22 Aug - 03 Sep	Wizz Air UK
31 Aug - 07 Sep	Iberia
26 Aug - 06 Sep	Iberia Express
18 Aug - 27 Aug	Iberia
26 Aug - 03 Sep	Iberia
21 Aug - 29 Aug	Iberia Express
19 Aug - 27 Aug	Iberia Express
19 Aug - 26 Aug	Iberia Express
18 Aug - 25 Aug	Iberia
17 Aug - 27 Aug	Iberia
18 Aug - 29 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 $274

Return flights