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

Return flights

30 Dec - 31 Jan	United
01 Dec - 07 Dec	Air Canada
24 Dec - 14 Jan	Air Canada
04 Dec - 11 Dec	Delta
24 Dec - 15 Jan	United
14 Dec - 07 Jan	jetBlue
14 Dec - 23 Dec	United
13 Dec - 07 Jan	jetBlue
12 Dec - 07 Jan	jetBlue
16 Dec - 23 Dec	United
13 Dec - 06 Jan	jetBlue
12 Dec - 06 Jan	jetBlue
25 Dec - 15 Jan	United
10 Dec - 17 Dec	jetBlue
15 Dec - 07 Jan	jetBlue
08 Dec - 15 Dec	jetBlue
24 Dec - 31 Dec	United
06 Dec - 13 Dec	jetBlue
13 Dec - 20 Dec	United
17 Dec - 21 Dec	United

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 $534

Return flights