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

Return flights

03 Dec - 17 Dec	British Airways
02 Dec - 23 Dec	British Airways
02 Dec - 16 Dec	British Airways
03 Dec - 24 Dec	British Airways
24 Dec - 14 Jan	British Airways
07 Dec - 21 Dec	British Airways
09 Dec - 30 Dec	Air Canada
08 Dec - 29 Dec	Air Canada
04 Dec - 14 Dec	British Airways
10 Dec - 31 Dec	British Airways
16 Dec - 06 Jan	British Airways
05 Dec - 27 Dec	British Airways
23 Dec - 13 Jan	Air Canada
30 Dec - 04 Jan	SWISS
17 Dec - 07 Jan	British Airways
18 Dec - 04 Jan	Frontier Airlines

Also check the deals for one-way flights from Philadelphia to Athens 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 Athens in December from $455

Return flights