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

Return flights

17 Aug - 28 Aug	Fly Play	direct
13 Aug - 17 Aug	Fly Play	direct
21 Aug - 26 Aug	Fly Play	direct
28 Aug - 01 Sep	Fly Play	direct
21 Aug - 21 Aug	Fly Play	direct
12 Aug - 19 Aug	Fly Play	direct
16 Aug - 19 Aug	Fly Play	direct
29 Aug - 13 Sep	transavia
05 Aug - 12 Aug	Fly Play	direct
13 Aug - 15 Aug	Fly Play
21 Aug - 22 Aug	Fly Play
14 Aug - 18 Aug	Fly Play
29 Aug - 13 Sep	Icelandair	direct
31 Aug - 14 Sep	Vueling Airlines

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

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 Keflavik to Dublin in August from $157

Return flights