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

Return flights

12 Aug - 22 Aug	KLM
13 Aug - 21 Aug	KLM
13 Aug - 22 Aug	Delta
12 Aug - 26 Aug	KLM
07 Aug - 21 Aug	Finnair
14 Aug - 21 Aug	Finnair
12 Aug - 19 Aug	Air Canada
14 Aug - 22 Aug	Iberia
14 Aug - 19 Aug	Iberia
08 Aug - 22 Aug	Iberia
26 Aug - 09 Sep	Iberia
23 Aug - 02 Sep	Icelandair
22 Aug - 02 Sep	Icelandair
21 Aug - 02 Sep	Air Canada
18 Aug - 01 Sep	Finnair
18 Aug - 01 Sep	Aer Lingus	direct
14 Aug - 17 Sep	Delta
20 Aug - 03 Sep	Air Canada
26 Aug - 09 Sep	Aer Lingus	direct
19 Aug - 02 Sep	Air Canada

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

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 August from 325€

Return flights