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

Return flights

30 Jul - 03 Aug	Fly Play	direct
27 Jul - 03 Aug	Iberia Express
26 Jul - 04 Aug	Iberia
26 Jul - 07 Aug	Iberia
23 Jul - 01 Aug	Fly Play	direct
23 Jul - 06 Aug	Fly Play	direct
27 Jul - 31 Jul	Iberia Express
27 Jul - 29 Jul	Iberia Express
26 Jul - 11 Aug	Iberia
27 Jul - 10 Aug	Iberia Express
30 Jul - 04 Aug	Ryanair
30 Jul - 07 Aug	Ryanair
23 Jul - 30 Jul	Fly Play	direct
26 Jul - 29 Jul	Iberia
28 Jul - 31 Jul	Ryanair
25 Jul - 30 Jul	Fly Play	direct
26 Jul - 30 Jul	Iberia
24 Jul - 31 Jul	Iberia
26 Jul - 28 Jul	Iberia
22 Jul - 29 Jul	Air Europa

Also check the deals for one-way flights from Madrid to Keflavik in July.

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 July from 304€

Return flights