Cheapest return flights from Dublin to Keflavik in September from $166

Best time to book flights for Dublin (DUB) to Keflavik (KEF) flights at AirHint

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

Return flights

24 Sep - 01 Oct Fly Play direct
24 Sep - 27 Sep Fly Play direct
01 Sep - 09 Sep Fly Play direct
01 Sep - 08 Sep Fly Play direct
08 Sep - 22 Sep Fly Play direct
12 Sep - 18 Sep Fly Play direct
05 Sep - 12 Sep Fly Play direct
12 Sep - 20 Sep Fly Play direct
15 Sep - 19 Sep Fly Play direct
08 Sep - 12 Sep Fly Play direct
12 Sep - 15 Sep Fly Play direct

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

Skyscanner

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.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik