Cheapest return flights from Boston to Philadelphia in September from $98

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

Return flights

18 Sep - 21 Sep Frontier Airlines direct
24 Sep - 28 Sep jetBlue direct
10 Sep - 14 Sep jetBlue direct
05 Sep - 07 Sep Spirit Airlines
26 Sep - 28 Sep Spirit Airlines
04 Sep - 04 Sep American Airlines direct
05 Sep - 07 Sep jetBlue direct
26 Sep - 28 Sep jetBlue direct
02 Sep - 21 Sep Spirit Airlines
02 Sep - 10 Sep Spirit Airlines
24 Sep - 03 Oct Spirit Airlines
24 Sep - 01 Oct Spirit Airlines
24 Sep - 05 Oct Spirit Airlines
27 Sep - 03 Oct Spirit Airlines
27 Sep - 01 Oct Spirit Airlines
27 Sep - 05 Oct Spirit Airlines
28 Sep - 03 Oct Spirit Airlines
28 Sep - 01 Oct Spirit Airlines
28 Sep - 05 Oct Spirit Airlines
23 Sep - 03 Oct Spirit Airlines

Also check the deals for one-way flights from Boston to Philadelphia in September.

Skyscanner

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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