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

Return flights

19 Aug - 26 Aug	jetBlue
17 Aug - 26 Aug	United
16 Aug - 23 Aug	Delta
22 Aug - 28 Aug	United
31 Aug - 04 Sep	jetBlue
16 Aug - 25 Aug	Delta
18 Aug - 03 Sep	jetBlue
29 Aug - 03 Sep	Air Canada
30 Aug - 17 Sep	Air France
19 Aug - 13 Sep	jetBlue
30 Aug - 20 Sep	United
23 Aug - 25 Aug	Delta
19 Aug - 22 Aug	jetBlue
27 Aug - 30 Aug	United
21 Aug - 11 Sep	jetBlue
20 Aug - 27 Aug	United
17 Aug - 06 Sep	jetBlue
31 Aug - 14 Sep	jetBlue
19 Aug - 31 Aug	United

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 391€

Return flights