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

Return flights

26 Aug - 02 Sep	United
26 Aug - 31 Aug	United
25 Aug - 02 Sep	United
21 Aug - 28 Aug	United
18 Aug - 22 Aug	Delta
24 Aug - 02 Sep	United
26 Aug - 30 Aug	Air France
25 Aug - 30 Aug	Air France
24 Aug - 31 Aug	Delta
25 Aug - 01 Sep	Air France
26 Aug - 01 Sep	Air France
27 Aug - 31 Aug	Delta
27 Aug - 01 Sep	Delta

Also check the deals for one-way flights from Portland 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 Portland to Dublin in August from 425€

Return flights