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

Return flights

24 Dec - 14 Jan	United
24 Dec - 13 Jan	United
24 Dec - 15 Jan	United
25 Dec - 15 Jan	United
25 Dec - 14 Jan	United
25 Dec - 16 Jan	United
23 Dec - 14 Jan	Delta
25 Dec - 08 Jan	United
16 Dec - 29 Dec	Delta
23 Dec - 08 Jan	United
30 Dec - 06 Jan	Delta
15 Dec - 26 Dec	Delta
22 Dec - 29 Dec	jetBlue
21 Dec - 30 Dec	Delta
20 Dec - 29 Dec	Air Canada
26 Dec - 28 Dec	jetBlue
21 Dec - 31 Dec	jetBlue

Also check the deals for one-way flights from Washington to Dublin in December.

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 December from 564€

Return flights