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

Return flights

13 Aug - 20 Aug	Air Canada
13 Aug - 21 Aug	Aer Lingus	direct
11 Aug - 18 Aug	British Airways
12 Aug - 22 Aug	Lufthansa
19 Aug - 28 Aug	Air Canada
08 Aug - 15 Aug	Air Canada
28 Aug - 04 Sep	Aer Lingus	direct
14 Aug - 19 Aug	Air Canada
25 Aug - 29 Aug	Frontier Airlines
20 Aug - 29 Aug	United
13 Aug - 20 Aug	Aer Lingus	direct
25 Aug - 01 Sep	Aer Lingus	direct
30 Aug - 06 Sep	Aer Lingus	direct

Also check the deals for one-way flights from Philadelphia 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 Philadelphia to Dublin in August from 449€

Return flights