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	Air France
03 Dec - 10 Dec	Aer Lingus	direct
16 Dec - 29 Jan	United
05 Dec - 12 Dec	Aer Lingus	direct
17 Dec - 29 Jan	United
10 Dec - 17 Dec	Aer Lingus	direct
15 Dec - 29 Dec	British Airways
15 Dec - 28 Dec	United
22 Dec - 12 Jan	Lufthansa
16 Dec - 29 Dec	United
16 Dec - 05 Jan	United
15 Dec - 22 Dec	Aer Lingus	direct
17 Dec - 31 Dec	United
25 Dec - 01 Jan	United
22 Dec - 06 Jan	Lufthansa
17 Dec - 01 Jan	United
12 Dec - 04 Jan	Icelandair
18 Dec - 01 Jan	United
15 Dec - 28 Dec	Aer Lingus	direct
22 Dec - 02 Jan	Lufthansa

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 313€

Return flights