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

Return flights

01 Dec - 08 Dec	Air France
04 Dec - 10 Dec	Air France
11 Dec - 17 Dec	Air France
29 Dec - 24 Jan	Air Canada
12 Dec - 17 Dec	Delta
11 Dec - 14 Dec	Air France
12 Dec - 18 Dec	United
15 Dec - 10 Jan	United
11 Dec - 07 Jan	United
16 Dec - 08 Jan	United
01 Dec - 27 Dec	Air Canada
02 Dec - 09 Dec	jetBlue
08 Dec - 15 Dec	jetBlue
22 Dec - 17 Jan	Air Canada
27 Dec - 05 Jan	Air Canada
22 Dec - 06 Jan	American Airlines
08 Dec - 03 Jan	Air Canada
27 Dec - 04 Jan	Air Canada
28 Dec - 02 Jan	Delta
21 Dec - 28 Dec	KLM

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.

Book a cheap hotel in Dublin

Cheap car rent in Dublin

Cheapest return flights from Washington to Dublin in December from 427€

Return flights