Cheapest one-way flights from Philadelphia to Boston in September from $49

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

One-Way flights

04 Sep Frontier Airlines direct
07 Sep Frontier Airlines direct
11 Sep Frontier Airlines direct
14 Sep Frontier Airlines direct
18 Sep Frontier Airlines direct
25 Sep Frontier Airlines direct
28 Sep Frontier Airlines direct
21 Sep Frontier Airlines direct
20 Sep jetBlue direct
19 Sep Spirit Airlines

Also check the deals for return 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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