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

Return flights

26 Aug - 30 Aug	Ryanair
30 Aug - 13 Sep	Aer Lingus
30 Aug - 06 Sep	Aer Lingus
30 Aug - 12 Sep	Aer Lingus
29 Aug - 06 Sep	Ryanair
19 Aug - 26 Aug	Ryanair
31 Aug - 09 Sep	Lufthansa
31 Aug - 12 Sep	Ryanair
31 Aug - 13 Sep	Ryanair
18 Aug - 25 Aug	Vueling Airlines
22 Aug - 24 Aug	Ryanair
12 Aug - 21 Aug	Ryanair
13 Aug - 21 Aug	Ryanair
12 Aug - 22 Aug	Ryanair
11 Aug - 20 Aug	Ryanair
16 Aug - 24 Aug	Ryanair
05 Aug - 09 Aug	Ryanair

Also check the deals for one-way flights from Marseille 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 Marseille to Keflavik in August from 282€

Return flights