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

Return flights

27 Oct - 12 Nov	Air France
20 Oct - 05 Nov	Air France
15 Oct - 24 Oct	Air Canada
10 Oct - 16 Oct	Icelandair
10 Oct - 15 Oct	Icelandair
10 Oct - 12 Oct	Icelandair
27 Oct - 03 Nov	Air Canada
08 Oct - 12 Oct	Icelandair
22 Oct - 29 Oct	Air France
13 Oct - 08 Nov	Air Canada
08 Oct - 29 Oct	Aer Lingus	direct
20 Oct - 05 Nov	Aer Lingus	direct
18 Oct - 08 Nov	Air Canada
20 Oct - 27 Oct	Air Canada
04 Oct - 10 Oct	Icelandair
22 Oct - 29 Oct	Aer Lingus	direct
30 Oct - 06 Nov	Delta
27 Oct - 03 Nov	Aer Lingus	direct
31 Oct - 07 Nov	Aer Lingus	direct

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

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 October from $413

Return flights