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

Return flights

02 Mar - 13 Mar	Lufthansa
09 Mar - 19 Mar	Lufthansa
09 Mar - 20 Mar	Lufthansa
01 Mar - 13 Mar	British Airways
09 Mar - 16 Mar	KLM
16 Mar - 23 Mar	Lufthansa
09 Mar - 23 Mar	Lufthansa
01 Mar - 13 Mar	Iberia	direct
04 Mar - 11 Mar	Iberia	direct
09 Mar - 20 Mar	Iberia	direct
25 Mar - 01 Apr	Aer Lingus	direct
30 Mar - 06 Apr	Aer Lingus	direct
13 Mar - 29 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 397€

Return flights