Cheapest return flights from Dublin to Keflavik in September from $157

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

Return flights

03 Sep - 08 Sep Fly Play direct
06 Sep - 11 Sep Fly Play direct
03 Sep - 04 Sep Fly Play direct
19 Sep - 22 Sep Fly Play direct
04 Sep - 07 Sep Fly Play direct
06 Sep - 10 Sep Fly Play direct
05 Sep - 08 Sep Fly Play direct
06 Sep - 08 Sep Fly Play direct
03 Sep - 10 Sep Fly Play direct
04 Sep - 11 Sep Fly Play direct
28 Sep - 05 Oct Fly Play direct
27 Sep - 01 Oct Ryanair
29 Sep - 02 Oct Ryanair
12 Sep - 28 Oct Icelandair direct
29 Sep - 02 Oct Fly Play direct

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

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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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