AirHint found the following cheapest return flights from Seattle (SEA) to Dublin (DUB) in April 2026 (see full year).

Return flights

14 Apr - 21 Apr	Icelandair
29 Apr - 06 May	Icelandair
21 Apr - 01 May	Icelandair
27 Apr - 04 May	Icelandair
19 Apr - 29 Apr	Icelandair
23 Apr - 29 Apr	Icelandair
14 Apr - 21 Apr	Aer Lingus	direct
22 Apr - 29 Apr	Aer Lingus	direct
19 Apr - 29 Apr	Aer Lingus	direct
13 Apr - 24 Apr	Aer Lingus	direct
21 Apr - 01 May	Aer Lingus	direct
05 Apr - 12 Apr	Turkish Airlines
09 Apr - 26 Apr	Lufthansa
27 Apr - 04 May	Aer Lingus	direct
10 Apr - 17 Apr	Air Canada

Also check the deals for one-way flights from Seattle to Dublin in April.

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 April from $474

Return flights