AirHint found the following cheapest return flights from Keflavik (KEF) to Reus (REU) in September 2025 (see full year).

Return flights

22 Sep - 29 Sep	Fly Play
11 Sep - 18 Sep	easyJet
25 Sep - 30 Sep	easyJet
15 Sep - 24 Sep	Fly Play
27 Sep - 29 Sep	Fly Play
17 Sep - 24 Sep	Icelandair
17 Sep - 25 Sep	Icelandair
15 Sep - 22 Sep	Fly Play
16 Sep - 25 Sep	Icelandair
06 Sep - 15 Sep	Icelandair

Also check the deals for one-way flights from Keflavik to Reus in September.

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 Reus in September from $501

Return flights