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

Return flights

03 Dec - 10 Dec	United
10 Dec - 14 Dec	Air Canada
08 Dec - 15 Dec	United
04 Dec - 07 Dec	Air Canada
04 Dec - 08 Dec	Air Canada
29 Dec - 24 Jan	Air Canada
13 Dec - 20 Dec	United
30 Dec - 06 Jan	United
01 Dec - 27 Dec	Air Canada
15 Dec - 10 Jan	Air Canada
16 Dec - 31 Dec	Delta
27 Dec - 05 Jan	Air Canada
08 Dec - 03 Jan	Air Canada
29 Dec - 04 Jan	Air Canada
30 Dec - 04 Jan	Air Canada
29 Dec - 05 Jan	Air Canada
28 Dec - 04 Jan	United
22 Dec - 17 Jan	Air Canada
23 Dec - 30 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 414€

Return flights