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

Return flights

09 Sep - 23 Sep	Iberia	direct
14 Sep - 23 Sep	Iberia	direct
28 Sep - 07 Oct	Aer Lingus	direct
16 Sep - 23 Sep	Aer Lingus	direct
30 Sep - 07 Oct	Aer Lingus	direct
30 Sep - 06 Oct	British Airways
28 Sep - 06 Oct	British Airways
13 Sep - 17 Sep	Aer Lingus	direct
04 Sep - 07 Sep	jetBlue
04 Sep - 08 Sep	jetBlue
14 Sep - 18 Sep	jetBlue
28 Sep - 06 Oct	Aer Lingus	direct
07 Sep - 14 Sep	jetBlue
30 Sep - 06 Oct	Aer Lingus	direct
28 Sep - 05 Oct	American Airlines	direct
20 Sep - 11 Oct	Air Canada
08 Sep - 14 Sep	jetBlue
28 Sep - 18 Oct	KLM
11 Sep - 15 Sep	jetBlue
19 Sep - 14 Oct	British Airways

Also check the deals for one-way flights from Philadelphia to Dublin in September.

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 September from $461

Return flights