AirHint found the following cheapest return flights from Philadelphia (PHL) to Bangkok (BKK) in December 2025 (see full year).
Return flights
| 03 Dec - 10 Dec | Qatar Airways | ||
| 07 Dec - 13 Dec | Delta | ||
| 27 Dec - 14 Jan | Qatar Airways | ||
| 13 Dec - 30 Dec | Frontier Airlines | ||
| 20 Dec - 05 Jan | Frontier Airlines |
Also check the deals for one-way flights from Philadelphia to Bangkok in December.
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