Cheapest return flights from Seattle to Dublin in September from $578

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

17 Sep - 24 Sep Icelandair
17 Sep - 26 Sep Icelandair
03 Sep - 13 Sep Scandinavian Airlines
07 Sep - 19 Sep Lufthansa
08 Sep - 19 Sep Lufthansa
10 Sep - 17 Sep Air France
16 Sep - 23 Sep Air France
09 Sep - 19 Sep Icelandair
15 Sep - 22 Sep KLM
29 Sep - 06 Oct KLM
12 Sep - 22 Sep Icelandair
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.

Book a cheap hotel in Dublin

Cheap car rent in Dublin