AirHint found the following cheapest one-way flights from Philadelphia (PHL) to Atlanta (ATL) in September 2025 (see full year).

One-Way flights

29 Sep	Frontier Airlines	direct
22 Sep	Spirit Airlines	direct
25 Sep	Frontier Airlines
30 Sep	Frontier Airlines
23 Sep	Frontier Airlines	direct
24 Sep	Frontier Airlines	direct
30 Sep	Frontier Airlines	direct
19 Sep	Frontier Airlines
25 Sep	Spirit Airlines	direct
20 Sep	Frontier Airlines

Also check the deals for return flights from Philadelphia to Atlanta 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 one-way flights from Philadelphia to Atlanta in September from $56

One-Way flights