$321 Cheap Flights from Seattle (SEA) to Bangkok (BKK)

View $321 flight on Sun, Jan 25, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Suvarnabhumi Intl. Airport (BKK)

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Cheap Flights from Seattle to Bangkok (SEA-BKK)

Prices were available within the past 7 days and start at $321 for one-way flights and $686 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Asiana Airlines
Tue, Sep 9 - Tue, Sep 30
SEA
Seattle
BKK
Bangkok
$686 Roundtrip, just found
$686
Roundtrip
just found
Select Asiana Airlines flight, departing Tue, Sep 9 from Seattle to Bangkok, returning Tue, Sep 30, priced at $686 just found
Delta
Tue, Sep 9 - Tue, Sep 23
SEA
Seattle
BKK
Bangkok
$695 Roundtrip, just found
$695
Roundtrip
just found
Select Delta flight, departing Tue, Sep 9 from Seattle to Bangkok, returning Tue, Sep 23, priced at $695 just found
Korean Air
Mon, Sep 1 - Tue, Sep 30
SEA
Seattle
BKK
Bangkok
$698 Roundtrip, just found
$698
Roundtrip
just found
Select Korean Air flight, departing Mon, Sep 1 from Seattle to Bangkok, returning Tue, Sep 30, priced at $698 just found
United
Thu, Oct 2 - Thu, Oct 16
SEA
Seattle
BKK
Bangkok
$708 Roundtrip, found 4 hours ago
$708
Roundtrip
found 4 hours ago
Select United flight, departing Thu, Oct 2 from Seattle to Bangkok, returning Thu, Oct 16, priced at $708 found 4 hours ago
Singapore Airlines
Sun, Jan 18 - Fri, Jan 23
SEA
Seattle
BKK
Bangkok
$720 Roundtrip, found 5 days ago
$720
Roundtrip
found 5 days ago
Select Singapore Airlines flight, departing Sun, Jan 18 from Seattle to Bangkok, returning Fri, Jan 23, priced at $720 found 5 days ago
All Nippon Airways
Wed, Nov 12 - Mon, Dec 1
SEA
Seattle
BKK
Bangkok
$724 Roundtrip, just found
$724
Roundtrip
just found
Select All Nippon Airways flight, departing Wed, Nov 12 from Seattle to Bangkok, returning Mon, Dec 1, priced at $724 just found
Philippine Airlines
Wed, Jan 21 - Mon, Feb 9
SEA
Seattle
BKK
Bangkok
$749 Roundtrip, just found
$749
Roundtrip
just found
Select Philippine Airlines flight, departing Wed, Jan 21 from Seattle to Bangkok, returning Mon, Feb 9, priced at $749 just found
China Airlines
Mon, Sep 1 - Tue, Sep 30
SEA
Seattle
BKK
Bangkok
$790 Roundtrip, just found
$790
Roundtrip
just found
Select China Airlines flight, departing Mon, Sep 1 from Seattle to Bangkok, returning Tue, Sep 30, priced at $790 just found
Japan Airlines
Thu, Jan 15 - Wed, Jan 21
SEA
Seattle
BKK
Bangkok
$826 Roundtrip, found 5 hours ago
$826
Roundtrip
found 5 hours ago
Select Japan Airlines flight, departing Thu, Jan 15 from Seattle to Bangkok, returning Wed, Jan 21, priced at $826 found 5 hours ago
STARLUX Airlines
Mon, Sep 1 - Tue, Sep 30
SEA
Seattle
BKK
Bangkok
$831 Roundtrip, just found
$831
Roundtrip
just found
Select STARLUX Airlines flight, departing Mon, Sep 1 from Seattle to Bangkok, returning Tue, Sep 30, priced at $831 just found

Find the cheapest month to fly from Seattle (SEA) to Bangkok (BKK)

March is typically the cheapest month to fly

From $654 - $888 per traveler.

Graph displaying average flight prices per month

Alternative airports near Bangkok

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Suvarnabhumi Intl. BKK. Cheapest option available. Average driving time to city center is 23 minutes. Flights from $694
BKK
Suvarnabhumi Intl.
Cheapest
Average driving time to city center23 min
Flights from $694
Flights from Seattle (SEA) to Bangkok (BKK)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Suvarnabhumi Intl.
Airlines serving
Air Canada, Air France, All Nippon Airways, American Airlines, Asiana Airlines, Cathay Pacific, China Airlines, Condor, Delta, EVA Airways, Emirates, Japan Airlines, KLM, Korean Air, Philippine Airlines, Qatar Airways, STARLUX Airlines, Thai Airways International, Turkish Airlines, United
Roundtrip price
$686
Distance
7448 mi

Seattle to Bangkok Flights

The cheapest times to fly from Seattle to Bangkok

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Bangkok are during the month of September. You can find some of the cheapest flights from Seattle to Bangkok with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Bangkok

Sunday is one of the best days to book for cheap flights from Seattle to Bangkok: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to Bangkok

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Bangkok in 2025. You can also book with separate airlines for your outbound and return journeys, from $321 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Bangkok flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Bangkok airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Suvarnabhumi Intl. Airport (BKK) cost?
Discover the latest flight deals from SEA to BKK by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from SEA to BKK?
The cheapest flights from SEA to BKK are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from SEA to BKK?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from SEA to BKK. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Suvarnabhumi Intl. Airport (BKK)?
There are no daily nonstop flights from Seattle - Tacoma Intl. Airport (SEA) to Suvarnabhumi Intl. Airport (BKK). But you can opt for flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be soaring above the clouds in no time.
What day of the week has the most flights from SEA to BKK?
You'll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Suvarnabhumi Intl. Airport (BKK)?
To arrive at Suvarnabhumi Intl. Airport (BKK) on schedule, select a flight that leaves Seattle - Tacoma Intl. Airport (SEA) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Suvarnabhumi Intl. Airport (BKK) last-minute?
Waiting until just before your trip to book a ticket from SEA to BKK often results in higher prices. While you might find some last-minute deals, they aren't always guaranteed. Keep your travel plans flexible to maximize your chances of getting a bargain.
Is it cheaper to book a SEA to BKK flight and hotel package?
You'll generally save money by booking a SEA to BKK flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. After choosing your preferred flights and accommodations, you can add extras like car rentals, tours and activities.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Suvarnabhumi Intl. Airport (BKK)?
In most cases, you can cancel or reschedule your SEA to BKK flight. However, additional fees may apply, especially if your booking was made over 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you need more details, head to our Customer Service portal.

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*Available to One Key members.