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

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

One-Way flights

11 Sep Frontier Airlines direct
18 Sep Frontier Airlines direct
21 Sep Frontier Airlines direct
04 Sep Frontier Airlines direct
07 Sep Frontier Airlines direct
25 Sep Frontier Airlines direct
28 Sep Frontier Airlines direct
14 Sep Frontier Airlines direct
15 Sep American Airlines direct
02 Sep Delta direct

Also check the deals for return 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.

Book a cheap hotel in Philadelphia

Cheap car rent in Philadelphia

Feel free to contact us with any feedback or request another flight research.