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

Return flights

13 Sep - 28 Sep	Fly Play	direct
27 Sep - 04 Oct	Fly Play	direct
25 Sep - 02 Oct	Fly Play	direct
03 Sep - 10 Sep	Fly Play	direct
27 Sep - 29 Sep	Fly Play	direct
03 Sep - 08 Sep	Fly Play	direct
18 Sep - 20 Sep	Fly Play	direct
06 Sep - 10 Sep	Fly Play	direct
04 Sep - 08 Sep	Fly Play	direct
10 Sep - 14 Sep	Fly Play	direct
06 Sep - 07 Sep	Fly Play	direct
12 Sep - 22 Sep	Fly Play	direct
28 Sep - 05 Oct	Fly Play	direct
25 Sep - 01 Oct	Ryanair
25 Sep - 01 Oct	Icelandair	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 136€

Return flights