AirHint found the following cheapest one-way flights from Boston (BOS) to Philadelphia (PHL) in December 2025 (see full year).
One-Way flights
| 10 Dec | Spirit Airlines | ||
| 10 Dec | jetBlue | direct | |
| 11 Dec | Delta | direct | |
| 15 Dec | Delta | direct | |
| 14 Dec | Delta | direct | |
| 13 Dec | United | ||
| 31 Dec | United | ||
| 07 Dec | Spirit Airlines | ||
| 18 Dec | Frontier Airlines | ||
| 30 Dec | United |
Also check the deals for return flights from Boston to Philadelphia in December.
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