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

Return flights

13 Aug - 20 Aug	Air Canada
11 Aug - 18 Aug	Air Canada
11 Aug - 22 Aug	SWISS
13 Aug - 21 Aug	Delta
12 Aug - 19 Aug	Delta
25 Aug - 03 Sep	Air Canada
13 Aug - 19 Aug	SWISS
11 Aug - 20 Aug	SWISS
20 Aug - 24 Aug	SWISS
20 Aug - 26 Aug	SWISS
22 Aug - 29 Aug	Icelandair
26 Aug - 02 Sep	Icelandair
25 Aug - 05 Sep	Delta
27 Aug - 10 Sep	Lufthansa
25 Aug - 05 Sep	Aer Lingus	direct
24 Aug - 05 Sep	Aer Lingus	direct
24 Aug - 04 Sep	Aer Lingus	direct
25 Aug - 03 Sep	Aer Lingus	direct
31 Aug - 08 Sep	Icelandair
28 Aug - 04 Sep	Aer Lingus	direct

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 291€

Return flights