Cheapest one-way flights from Boston to Philadelphia in September from 42€

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

One-Way flights

04 Sep Frontier Airlines direct
14 Sep Frontier Airlines direct
28 Sep Frontier Airlines direct
11 Sep Frontier Airlines direct
18 Sep Frontier Airlines direct
21 Sep Frontier Airlines direct
17 Sep Spirit Airlines
08 Sep Spirit Airlines
20 Sep Spirit Airlines
15 Sep Spirit Airlines

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.

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