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

Return flights

11 Aug - 21 Aug	Air Canada
13 Aug - 20 Aug	United
11 Aug - 20 Aug	KLM
05 Aug - 12 Aug	United
06 Aug - 13 Aug	Air Canada
06 Aug - 10 Sep	Air Canada
14 Aug - 21 Aug	jetBlue
11 Aug - 19 Aug	Air Canada
13 Aug - 19 Aug	Air Canada
04 Aug - 19 Aug	Delta
10 Aug - 19 Aug	Delta
28 Aug - 02 Sep	Air Canada
22 Aug - 01 Sep	Air Canada
31 Aug - 14 Sep	Delta
25 Aug - 01 Sep	United
30 Aug - 06 Sep	United
27 Aug - 03 Sep	United
26 Aug - 30 Sep	Delta

Also check the deals for one-way flights from Washington 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 Washington to Dublin in August from 392€

Return flights