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

Return flights

10 Dec - 14 Dec	Air France
11 Dec - 14 Dec	Air France
24 Dec - 30 Dec	United
25 Dec - 31 Dec	Air Canada
29 Dec - 24 Jan	Air Canada
02 Dec - 09 Dec	jetBlue
27 Dec - 13 Jan	Finnair
07 Dec - 14 Dec	jetBlue
01 Dec - 27 Dec	United
16 Dec - 10 Jan	Finnair
22 Dec - 17 Jan	Air Canada
08 Dec - 03 Jan	Air Canada
12 Dec - 19 Dec	jetBlue
23 Dec - 30 Dec	Delta
17 Dec - 24 Dec	jetBlue
28 Dec - 07 Jan	Icelandair
19 Dec - 06 Jan	United
27 Dec - 03 Jan	Air Canada
25 Dec - 05 Jan	TAP
17 Dec - 04 Jan	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 $493

Return flights