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

One-Way flights

29 Jul	Frontier Airlines	direct
22 Jul	Frontier Airlines	direct
15 Jul	Frontier Airlines	direct
08 Jul	Frontier Airlines	direct
24 Jul	Frontier Airlines	direct
31 Jul	Frontier Airlines	direct
13 Jul	Frontier Airlines	direct
20 Jul	Frontier Airlines	direct
27 Jul	Frontier Airlines	direct
10 Jul	Frontier Airlines	direct

Also check the deals for return flights from Boston to Philadelphia in July.

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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Cheapest one-way flights from Boston to Philadelphia in July from $29

One-Way flights