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

Return flights

13 Aug - 22 Aug	Air Canada
11 Aug - 20 Aug	Air Canada
13 Aug - 20 Aug	Air Canada
11 Aug - 25 Aug	Air Canada
28 Aug - 02 Sep	Icelandair
31 Aug - 08 Sep	Icelandair
31 Aug - 07 Sep	Icelandair
01 Aug - 05 Aug	Icelandair
24 Aug - 05 Sep	Air Canada
25 Aug - 16 Sep	Air Canada
15 Aug - 28 Aug	Icelandair
19 Aug - 24 Aug	Air Canada
16 Aug - 26 Aug	Air Canada
16 Aug - 23 Aug	Icelandair
20 Aug - 26 Aug	Delta
23 Aug - 01 Sep	Air Canada
24 Aug - 04 Sep	Lufthansa
27 Aug - 10 Sep	Delta
24 Aug - 04 Sep	Aer Lingus	direct
29 Aug - 03 Sep	Air Canada

Also check the deals for one-way flights from Denver 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 Denver to Dublin in August from $341

Return flights