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

Return flights

03 Dec - 10 Dec	Icelandair
03 Dec - 10 Dec	Aer Lingus	direct
13 Dec - 19 Dec	British Airways
08 Dec - 15 Dec	United	direct
07 Dec - 21 Dec	United
13 Dec - 20 Dec	Icelandair
07 Dec - 21 Dec	Aer Lingus	direct
13 Dec - 20 Dec	United	direct
30 Dec - 06 Jan	British Airways
06 Dec - 20 Dec	Aer Lingus	direct
26 Dec - 31 Dec	United
29 Dec - 05 Jan	TAP
22 Dec - 12 Jan	Icelandair
30 Dec - 06 Jan	Aer Lingus	direct
30 Dec - 04 Jan	SWISS
29 Dec - 04 Jan	Lufthansa
28 Dec - 04 Jan	United
27 Dec - 03 Jan	United
22 Dec - 05 Jan	TAP
22 Dec - 02 Jan	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.

Book a cheap hotel in Dublin

Cheap car rent in Dublin

Cheapest return flights from Washington to Dublin in December from 346€

Return flights