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

Return flights

03 Dec - 10 Dec	Aer Lingus	direct
01 Dec - 11 Dec	Air Canada
01 Dec - 09 Dec	Air Canada
02 Dec - 10 Dec	Air Canada
02 Dec - 12 Dec	Air Canada
01 Dec - 06 Dec	Icelandair
04 Dec - 09 Dec	Icelandair
05 Dec - 10 Dec	Icelandair
06 Dec - 11 Dec	Icelandair
02 Dec - 11 Dec	Icelandair
26 Dec - 17 Jan	American Airlines
31 Dec - 07 Jan	United
12 Dec - 06 Jan	Icelandair
10 Dec - 04 Jan	Lufthansa
27 Dec - 03 Jan	Air Canada
10 Dec - 04 Jan	Aer Lingus	direct
19 Dec - 02 Jan	Air Canada
17 Dec - 03 Jan	Lufthansa
20 Dec - 05 Jan	Air Canada
20 Dec - 03 Jan	Air Canada

Also check the deals for one-way flights from Seattle 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 Seattle to Dublin in December from $336

Return flights