Cheapest return flights from Seattle to Dublin in September from $476

Best time to book flights for Seattle (SEA) to Dublin (DUB) flights at AirHint

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

Return flights

01 Sep - 07 Sep Scandinavian Airlines
24 Sep - 30 Sep Scandinavian Airlines
08 Sep - 04 Oct Scandinavian Airlines
02 Sep - 11 Sep Icelandair
13 Sep - 04 Oct Icelandair
04 Sep - 20 Sep Icelandair
23 Sep - 30 Sep Icelandair
03 Sep - 10 Sep Aer Lingus direct
29 Sep - 06 Oct Icelandair
08 Sep - 15 Sep Aer Lingus direct
23 Sep - 30 Sep Aer Lingus direct
24 Sep - 30 Sep Aer Lingus direct
13 Sep - 20 Sep Aer Lingus direct
29 Sep - 06 Oct Aer Lingus direct

Also check the deals for one-way 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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