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

Return flights

05 Dec - 09 Dec	Saudia
02 Dec - 09 Dec	Turkish Airlines
01 Dec - 09 Dec	Turkish Airlines
01 Dec - 05 Dec	Turkish Airlines
01 Dec - 07 Dec	Turkish Airlines
04 Dec - 09 Dec	Turkish Airlines
01 Dec - 08 Dec	United
01 Dec - 25 Dec	United
02 Dec - 31 Jan	Turkish Airlines
04 Dec - 15 Jan	ANA
05 Dec - 15 Jan	ANA
08 Dec - 18 Dec	Etihad Airways
09 Dec - 16 Dec	IndiGo
31 Dec - 18 Jan	jetBlue
08 Dec - 20 Jan	ANA
28 Dec - 17 Jan	SWISS
26 Dec - 18 Jan	Lufthansa
29 Dec - 10 Jan	IndiGo
27 Dec - 18 Jan	Delta
26 Dec - 10 Jan	IndiGo

Also check the deals for one-way flights from Washington 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 Washington to Bangkok in December from $791

Return flights