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

Return flights

15 Oct - 14 Nov	Lufthansa
20 Oct - 05 Nov	Air France
15 Oct - 22 Oct	Icelandair
13 Oct - 20 Oct	Air Canada
22 Oct - 24 Nov	KLM
10 Oct - 17 Oct	Icelandair
21 Oct - 24 Nov	KLM
15 Oct - 14 Nov	Aer Lingus	direct
20 Oct - 05 Nov	Aer Lingus	direct
13 Oct - 22 Oct	Delta
15 Oct - 24 Oct	Delta
16 Oct - 19 Nov	Air France
13 Oct - 23 Oct	Aer Lingus	direct
15 Oct - 22 Oct	Aer Lingus	direct
13 Oct - 22 Oct	Aer Lingus	direct
15 Oct - 24 Oct	Aer Lingus	direct
06 Oct - 15 Oct	Delta
24 Oct - 24 Nov	Air Canada
30 Oct - 05 Nov	Air France
27 Oct - 02 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 348€

Return flights