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

Return flights

20 Sep - 01 Oct	British Airways
29 Sep - 07 Oct	American Airlines
15 Sep - 11 Oct	British Airways
30 Sep - 10 Oct	British Airways
19 Sep - 03 Oct	British Airways
11 Sep - 18 Sep	Spirit Airlines
18 Sep - 11 Oct	British Airways
09 Sep - 23 Sep	Spirit Airlines
15 Sep - 11 Oct	Finnair	direct
12 Sep - 27 Sep	Frontier Airlines
08 Sep - 19 Sep	Air Canada
09 Sep - 19 Sep	United
10 Sep - 04 Oct	Frontier Airlines
09 Sep - 23 Sep	British Airways	direct
08 Sep - 19 Sep	British Airways	direct
20 Sep - 01 Oct	American Airlines	direct
30 Sep - 10 Oct	Finnair	direct
11 Sep - 18 Sep	Finnair	direct

Also check the deals for one-way flights from Philadelphia to Athens 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 Athens in September from $559

Return flights