AirHint found the following cheapest return flights from Seattle (SEA) to Bangkok (BKK) in October 2025 (see full year).

Return flights

23 Oct - 14 Nov	Asiana Airlines
29 Oct - 12 Nov	Asiana Airlines
29 Oct - 09 Nov	Asiana Airlines
05 Oct - 21 Oct	Philippine Airlines
23 Oct - 30 Oct	Korean Air
30 Oct - 09 Nov	Korean Air
23 Oct - 04 Nov	Korean Air
25 Oct - 20 Nov	Singapore Airlines
26 Oct - 09 Nov	Korean Air
31 Oct - 08 Nov	Korean Air
31 Oct - 15 Nov	Korean Air
14 Oct - 22 Oct	Singapore Airlines
15 Oct - 17 Nov	China Airlines
09 Oct - 12 Oct	Alaska Airlines
09 Oct - 18 Oct	Alaska Airlines
18 Oct - 25 Oct	WestJet
11 Oct - 17 Oct	Saudia
17 Oct - 19 Oct	China Airlines
01 Oct - 18 Oct	Alaska Airlines

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

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 October from $639

Return flights