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

One-Way flights

16 Dec	Southwest Airlines
04 Dec	Frontier Airlines	direct
08 Dec	Frontier Airlines	direct
11 Dec	Frontier Airlines	direct
15 Dec	Frontier Airlines	direct
05 Dec	Frontier Airlines	direct
07 Dec	Frontier Airlines	direct
12 Dec	Frontier Airlines	direct
14 Dec	Frontier Airlines	direct
01 Dec	Frontier Airlines	direct

Also check the deals for return flights from Jacksonville to Philadelphia in December.

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 December from 75€

One-Way flights