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

Return flights

29 Aug - 08 Sep	Norwegian
24 Aug - 01 Sep	Iberia
22 Aug - 30 Aug	LOT
22 Aug - 31 Aug	LOT
27 Aug - 05 Sep	Norwegian
27 Aug - 03 Sep	Norwegian
29 Aug - 11 Sep	Norwegian
25 Aug - 01 Sep	Iberia
23 Aug - 02 Sep	LOT
31 Aug - 09 Sep	Iberia
04 Aug - 20 Aug	Wizz Air UK
28 Aug - 06 Sep	Iberia
24 Aug - 29 Aug	Iberia
26 Aug - 05 Sep	Iberia
18 Aug - 25 Aug	Iberia
22 Aug - 27 Aug	Wizz Air UK
22 Aug - 29 Aug	Wizz Air UK
18 Aug - 29 Aug	Iberia
24 Aug - 30 Aug	Iberia
20 Aug - 30 Aug	LOT

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 $255

Return flights