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

Return flights

05 Dec - 12 Dec	Iberia	direct
05 Dec - 10 Dec	Aer Lingus	direct
02 Dec - 09 Dec	Lufthansa
02 Dec - 11 Dec	Lufthansa
03 Dec - 10 Dec	Aer Lingus	direct
02 Dec - 11 Dec	Aer Lingus	direct
04 Dec - 11 Dec	Air Canada
04 Dec - 11 Dec	Iberia	direct
25 Dec - 08 Jan	British Airways
09 Dec - 16 Dec	American Airlines
15 Dec - 28 Dec	Delta
29 Dec - 06 Jan	Finnair
27 Dec - 06 Jan	British Airways
25 Dec - 05 Jan	British Airways
08 Dec - 05 Jan	Frontier Airlines
29 Dec - 06 Jan	Finnair	direct
27 Dec - 06 Jan	Finnair	direct
29 Dec - 04 Jan	Spirit Airlines
19 Dec - 13 Jan	Spirit Airlines
27 Dec - 01 Jan	Air Canada

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

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 December from $467

Return flights