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

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

Return flights

11 Sep - 14 Sep Frontier Airlines direct
05 Sep - 07 Sep Spirit Airlines
20 Sep - 27 Sep jetBlue direct
05 Sep - 07 Sep jetBlue direct
15 Sep - 22 Sep American Airlines direct
12 Sep - 12 Sep Spirit Airlines
19 Sep - 25 Sep Spirit Airlines
11 Sep - 25 Sep Spirit Airlines
11 Sep - 12 Sep Spirit Airlines
11 Sep - 18 Sep Spirit Airlines
19 Sep - 03 Oct Spirit Airlines
19 Sep - 02 Oct Spirit Airlines
28 Sep - 18 Oct Spirit Airlines
28 Sep - 14 Oct Spirit Airlines
28 Sep - 03 Oct Spirit Airlines
28 Sep - 02 Oct Spirit Airlines
15 Sep - 03 Oct Spirit Airlines
15 Sep - 02 Oct Spirit Airlines
29 Sep - 18 Oct Spirit Airlines
29 Sep - 14 Oct Spirit Airlines

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