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

Return flights

12 Sep - 22 Sep	Ryanair
11 Sep - 22 Sep	Ryanair
10 Sep - 22 Sep	Ryanair
13 Sep - 22 Sep	Jet2
17 Sep - 25 Sep	Jet2
17 Sep - 22 Sep	Jet2
17 Sep - 27 Sep	Jet2
24 Sep - 27 Sep	Jet2
10 Sep - 25 Sep	Jet2
29 Sep - 09 Oct	Ryanair
03 Sep - 13 Sep	Jet2
30 Sep - 09 Oct	easyJet
23 Sep - 02 Oct	Ryanair
30 Sep - 07 Oct	easyJet
15 Sep - 02 Oct	Ryanair
23 Sep - 04 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 246€

Return flights