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

Return flights

10 Sep - 25 Sep	Jet2
24 Sep - 29 Sep	Jet2
18 Sep - 22 Sep	Ryanair
25 Sep - 02 Oct	Ryanair
10 Sep - 20 Sep	Jet2
10 Sep - 17 Sep	Jet2
11 Sep - 20 Sep	Ryanair
23 Sep - 27 Sep	Ryanair
18 Sep - 30 Sep	Ryanair
08 Sep - 13 Sep	Ryanair
30 Sep - 07 Oct	easyJet
16 Sep - 25 Sep	Ryanair
22 Sep - 06 Oct	Ryanair

Also check the deals for one-way flights from Reus to Keflavik 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 Reus to Keflavik in September from $418

Return flights