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

One-Way flights

26 Jul	Frontier Airlines	direct
24 Jul	Frontier Airlines	direct
25 Jul	Frontier Airlines	direct
27 Jul	Frontier Airlines	direct
28 Jul	Frontier Airlines	direct
31 Jul	Frontier Airlines	direct
17 Jul	Frontier Airlines
19 Jul	Frontier Airlines	direct
20 Jul	Frontier Airlines	direct
21 Jul	Frontier Airlines	direct

Also check the deals for return flights from Jacksonville 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 Jacksonville to Philadelphia in July from 86€

One-Way flights