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

Return flights

07 Dec - 14 Dec	jetBlue
03 Dec - 31 Dec	EVA Air
14 Dec - 08 Jan	Delta
11 Dec - 06 Jan	Alaska Airlines
30 Dec - 06 Jan	Delta
16 Dec - 08 Jan	jetBlue
13 Dec - 30 Dec	China Airlines
20 Dec - 09 Jan	Air Canada
30 Dec - 04 Jan	Japan Airlines
16 Dec - 02 Jan	Air Canada
18 Dec - 06 Jan	jetBlue
21 Dec - 31 Dec	Air Canada
16 Dec - 04 Jan	Finnair
23 Dec - 03 Jan	Cathay Pacific
19 Dec - 31 Dec	Alaska Airlines

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 $1000

Return flights