AirHint found the following cheapest return flights from Keflavik (KEF) to Madrid (MAD) in August 2025 (see full year).

Return flights

21 Aug - 27 Aug	Iberia Express	direct
20 Aug - 27 Aug	Iberia Express	direct
22 Aug - 27 Aug	SWISS
19 Aug - 26 Aug	Lufthansa
17 Aug - 24 Aug	Lufthansa
23 Aug - 30 Aug	Wizz Air
24 Aug - 31 Aug	Wizz Air
22 Aug - 27 Aug	Fly Play	direct
16 Aug - 30 Aug	Lufthansa
16 Aug - 23 Aug	Lufthansa
27 Aug - 07 Sep	easyJet
27 Aug - 03 Sep	easyJet
30 Aug - 10 Sep	easyJet
29 Aug - 05 Sep	Transavia France
27 Aug - 03 Sep	Fly Play	direct
29 Aug - 05 Sep	Fly Play	direct

Also check the deals for one-way flights from Keflavik to Madrid 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 Keflavik to Madrid in August from 171€

Return flights