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

Return flights

26 Sep - 03 Oct	Ryanair
10 Sep - 22 Sep	Jet2
17 Sep - 20 Sep	Jet2
03 Sep - 08 Sep	Jet2
17 Sep - 27 Sep	Jet2
17 Sep - 29 Sep	Jet2
02 Sep - 13 Sep	Ryanair
02 Sep - 11 Sep	Ryanair
04 Sep - 15 Sep	Ryanair
03 Sep - 11 Sep	Jet2
04 Sep - 13 Sep	Ryanair
25 Sep - 09 Oct	Ryanair
24 Sep - 06 Oct	Jet2
18 Sep - 05 Oct	Ryanair
24 Sep - 05 Oct	Jet2
25 Sep - 06 Oct	Ryanair
24 Sep - 04 Oct	Jet2
22 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 248€

Return flights