Flights Bangkok to Seattle (BKK-SEA): Airlines, THB Fares

Bangkok to Seattle links Thailand with the US Pacific Northwest, a region with a steady Thai community and a strong pull for students and technology-sector professionals. The route carries people visiting family, students, professionals and travellers using Seattle as their entry point to the Northwest and onward across the United States.

There is no nonstop service; block times near 17.5 hours reflect a connection through the operating carrier’s Asian hub. At around 7 flights a week — roughly daily — the corridor is dependable, with demand rising around the year-end holidays and the long mid-year break.

Corridor profile

Airlines & baggage

Airlines on this route

Three carriers serve BKK-SEA, all full-service and all routing via a hub: EVA Air via Taipei, Cathay Pacific via Hong Kong and Korean Air via Seoul’s Incheon. On a journey approaching eighteen hours, the connecting airport, the layover and the checked baggage allowance matter as much as the fare. With three options, comparing schedules and layover lengths on your travel dates is usually worth the effort.

Monthly market-low pattern (THB)

Fare trends

BKK-SEA is a long-haul route where booking ahead pays off. The year-end holidays and the mid-year break are the busiest and dearest — eight to fourteen weeks of lead time is sensible for those windows. Outside them, a six-to-ten-week window often finds a workable economy fare in THB, with the hub carriers competing on connecting itineraries. Flexibility on dates and on the transit hub both help keep the cost down.

Seasonality & best time to book

Bangkok–Seattle fares move with demand. The cheapest windows fall outside school holidays, Songkran and New Year; book 4–8 weeks ahead for normal dates. As a migrant-worker corridor, demand rises around contract turnover and long holidays — book early.

About Seattle

Seattle is the largest city of the US Pacific Northwest, set between Puget Sound and the mountains, with a green, rainy climate and a strong technology economy that draws professionals and students worldwide. It has a settled Thai community, with temples and restaurants across the metro area. For Thai travellers, Seattle serves as a family destination, a study or work base, and a gateway to the Northwest’s national parks and onward US travel.

FAQ

Which airlines fly Bangkok to Seattle?

The BKK-SEA route is operated by EVA Air, Cathay Pacific and Korean Air. Compare baggage, alliances and fares in the table above.

How long and how often is the BKK-SEA flight?

Block time is ~17.5h, with ~7 flights per week across all carriers.

When is BKK-SEA cheapest to book?

The cheapest fare in our cache is ~฿15,560. Book 4–8 weeks ahead; avoid Songkran, school holidays and peak season to save 15–30%.

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Related

• BKK airport
• SEA airport