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

Return flights

26 Sep - 28 Sep	Fly Play	direct
05 Sep - 07 Sep	Fly Play	direct
05 Sep - 06 Sep	Fly Play	direct
06 Sep - 13 Sep	Fly Play	direct
04 Sep - 08 Sep	Fly Play	direct
05 Sep - 08 Sep	Fly Play	direct
25 Sep - 28 Sep	Fly Play	direct
18 Sep - 21 Sep	Fly Play	direct
13 Sep - 14 Sep	Fly Play	direct
03 Sep - 06 Sep	Fly Play	direct
27 Sep - 04 Oct	Fly Play	direct
26 Sep - 05 Oct	Fly Play	direct
28 Sep - 05 Oct	Fly Play	direct
21 Sep - 05 Oct	Fly Play	direct
27 Sep - 01 Oct	Ryanair
13 Sep - 13 Oct	Ryanair
29 Sep - 06 Oct	Ryanair
29 Sep - 06 Oct	Fly Play	direct

Also check the deals for one-way flights from Dublin 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 Dublin to Keflavik in September from 138€

Return flights