AirHint found the following cheapest return flights from Seattle (SEA) to Bangkok (BKK) in January 2026 (see full year).

Return flights

18 Jan - 06 Feb	Singapore Airlines
22 Jan - 29 Jan	Singapore Airlines
18 Jan - 29 Jan	Singapore Airlines
20 Jan - 28 Jan	Singapore Airlines
22 Jan - 12 Feb	Singapore Airlines
27 Jan - 06 Feb	Singapore Airlines
27 Jan - 24 Feb	Asiana Airlines
08 Jan - 29 Jan	Philippine Airlines
14 Jan - 07 Feb	China Airlines
01 Jan - 31 Jan	STARLUX Airlines
10 Jan - 19 Jan	STARLUX Airlines
10 Jan - 24 Jan	STARLUX Airlines
07 Jan - 21 Jan	STARLUX Airlines
01 Jan - 17 Jan	STARLUX Airlines

Also check the deals for one-way flights from Seattle to Bangkok in January.

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.

Book a cheap hotel in Bangkok

Cheap car rent in Bangkok

Cheapest return flights from Seattle to Bangkok in January from 487€

Return flights