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

Return flights

05 Aug - 21 Aug	jetBlue
14 Aug - 22 Aug	jetBlue
13 Aug - 20 Aug	United
19 Aug - 31 Aug	jetBlue
04 Aug - 19 Aug	jetBlue
10 Aug - 23 Aug	jetBlue
26 Aug - 08 Sep	jetBlue
04 Aug - 13 Aug	Air Canada
02 Aug - 22 Aug	Air Canada
31 Aug - 14 Sep	jetBlue
10 Aug - 18 Aug	Air Canada
04 Aug - 11 Aug	Air Canada
29 Aug - 02 Sep	Air Canada
28 Aug - 04 Sep	United
29 Aug - 01 Sep	jetBlue

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 $435

Return flights