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

Return flights

13 Dec - 15 Dec	Finnair
11 Dec - 14 Dec	Finnair
05 Dec - 14 Dec	Finnair
06 Dec - 14 Dec	Finnair
06 Dec - 08 Dec	Finnair	direct
05 Dec - 10 Dec	Finnair	direct
03 Dec - 07 Dec	Finnair	direct
04 Dec - 18 Dec	Delta
07 Dec - 10 Dec	Aer Lingus	direct
05 Dec - 12 Dec	Delta
27 Dec - 12 Jan	Iberia
27 Dec - 06 Jan	Iberia	direct
27 Dec - 12 Jan	Finnair	direct
17 Dec - 06 Jan	Aer Lingus	direct
23 Dec - 01 Jan	Finnair	direct
26 Dec - 05 Jan	Finnair	direct
27 Dec - 01 Jan	Finnair	direct
27 Dec - 04 Jan	American Airlines
29 Dec - 05 Jan	Delta
27 Dec - 02 Jan	Delta

Also check the deals for one-way flights from Dublin to Philadelphia 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 Dublin to Philadelphia in December from 370€

Return flights