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

Return flights

19 Aug - 26 Aug	United
24 Aug - 31 Aug	jetBlue
23 Aug - 13 Sep	Spirit Airlines
19 Aug - 28 Aug	jetBlue
22 Aug - 25 Aug	Air Canada
30 Aug - 10 Sep	Aer Lingus	direct
23 Aug - 13 Sep	Aer Lingus	direct
22 Aug - 13 Sep	Aer Lingus	direct
16 Aug - 21 Aug	Aer Lingus	direct
29 Aug - 02 Sep	Aer Lingus	direct
21 Aug - 28 Aug	Frontier Airlines
18 Aug - 13 Sep	Spirit Airlines
22 Aug - 24 Aug	Delta
21 Aug - 24 Aug	Delta
17 Aug - 06 Sep	Aer Lingus
21 Aug - 29 Aug	Frontier Airlines
19 Aug - 26 Aug	Finnair	direct
17 Aug - 06 Sep	Aer Lingus	direct
18 Aug - 13 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 479€

Return flights