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

Return flights

08 Dec - 15 Dec	jetBlue
07 Dec - 14 Dec	Air Canada
27 Dec - 17 Jan	Air Canada
29 Dec - 24 Jan	Air Canada
02 Dec - 15 Dec	Delta
24 Dec - 11 Jan	Air Canada
16 Dec - 24 Dec	Delta
16 Dec - 23 Dec	United
10 Dec - 17 Dec	jetBlue
01 Dec - 27 Dec	United
13 Dec - 20 Dec	Delta
12 Dec - 19 Dec	jetBlue
15 Dec - 26 Dec	Delta
19 Dec - 09 Jan	KLM
19 Dec - 10 Jan	Air France
19 Dec - 11 Jan	Delta
29 Dec - 05 Jan	jetBlue
19 Dec - 05 Jan	KLM
10 Dec - 03 Jan	United
22 Dec - 04 Jan	Delta

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 421€

Return flights