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

Return flights

06 Mar - 13 Mar	Icelandair
02 Mar - 09 Mar	Icelandair
09 Mar - 16 Mar	Icelandair
23 Mar - 01 Apr	Air Canada
30 Mar - 06 Apr	Icelandair
09 Mar - 04 Apr	Icelandair
02 Mar - 09 Mar	Aer Lingus	direct
16 Mar - 25 Mar	Aer Lingus	direct
22 Mar - 30 Mar	Icelandair
21 Mar - 16 Apr	Delta
16 Mar - 11 Apr	Icelandair
15 Mar - 23 Mar	Aer Lingus	direct
20 Mar - 27 Mar	Aer Lingus	direct
21 Mar - 29 Mar	Delta
30 Mar - 06 Apr	Aer Lingus	direct

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

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 March from 367€

Return flights