AirHint found the following cheapest return flights from Boston (BOS) to Philadelphia (PHL) in December 2025 (see full year).

Return flights

03 Dec - 10 Dec	Delta	direct
13 Dec - 15 Dec	Delta	direct
05 Dec - 09 Dec	Delta	direct
05 Dec - 10 Dec	Delta	direct
04 Dec - 07 Dec	Delta	direct
11 Dec - 14 Dec	Delta	direct
08 Dec - 18 Dec	Delta	direct
09 Dec - 19 Dec	Delta	direct
10 Dec - 20 Dec	Delta	direct
11 Dec - 21 Dec	Delta	direct
19 Dec - 06 Jan	Delta	direct

Also check the deals for one-way flights from Boston 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 return flights from Boston to Philadelphia in December from 109€

Return flights