Cheapest one-way flights from Seattle to Dublin in September from $264

AirHint found the following cheapest one-way flights from Seattle (SEA) to Dublin (DUB) in September 2025 (see full year).

One-Way flights

28 Sep WestJet
23 Sep Alaska Airlines
30 Sep Hawaiian Airlines
17 Sep WestJet
25 Sep Frontier Airlines
22 Sep Hawaiian Airlines
16 Sep jetBlue
24 Sep Air Canada
12 Sep Frontier Airlines
11 Sep Hawaiian Airlines

Also check the deals for return flights from Seattle to Dublin in September.

Skyscanner

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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