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

Return flights

21 May - 31 May	Icelandair
09 May - 16 May	Icelandair
02 May - 23 May	Icelandair
14 May - 06 Jun	Icelandair
19 May - 26 May	Icelandair
19 May - 26 May	Aer Lingus	direct
22 May - 31 May	Icelandair
27 May - 20 Jun	Lufthansa
15 May - 29 May	British Airways
16 May - 06 Jun	Air Canada
15 May - 29 May	Aer Lingus	direct
27 May - 20 Jun	Aer Lingus	direct
02 May - 23 May	Aer Lingus	direct
09 May - 16 May	Aer Lingus	direct
16 May - 06 Jun	Aer Lingus	direct
14 May - 06 Jun	Aer Lingus	direct

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

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 May from $459

Return flights