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

Return flights

05 Dec - 25 Dec	ANA
14 Dec - 20 Dec	ANA
13 Dec - 09 Jan	Alaska Airlines
20 Dec - 08 Jan	Hawaiian Airlines
19 Dec - 08 Jan	Alaska Airlines
19 Dec - 07 Jan	Alaska Airlines
20 Dec - 07 Jan	Alaska Airlines
20 Dec - 06 Jan	Hawaiian Airlines

Also check the deals for one-way flights from Philadelphia to Bangkok 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 Philadelphia to Bangkok in December from $1076

Return flights