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

Return flights

01 Feb - 04 Mar	Singapore Airlines
04 Feb - 16 Feb	Korean Air
08 Feb - 20 Feb	Korean Air
15 Feb - 27 Feb	Korean Air
03 Feb - 13 Feb	Korean Air
06 Feb - 18 Feb	Korean Air
08 Feb - 15 Feb	Korean Air
02 Feb - 17 Feb	Korean Air
20 Feb - 26 Feb	Korean Air
04 Feb - 14 Feb	Korean Air
01 Feb - 12 Feb	Korean Air
25 Feb - 18 Mar	Korean Air
23 Feb - 02 Mar	Korean Air
28 Feb - 11 Mar	Korean Air
23 Feb - 05 Mar	Korean Air
27 Feb - 13 Mar	Korean Air
08 Feb - 11 Mar	Korean Air
01 Feb - 11 Mar	Korean Air
05 Feb - 06 Mar	Delta
07 Feb - 07 Mar	Delta

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

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 Seattle to Bangkok in February from $640

Return flights