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$278+ Cheap flights from Washington to Thailand

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BKK
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
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Cheap flight deals from Washington to Thailand

Keep the following information in mind while searching for Washington to Thailand flight deals. Data was last updated November 3, 2025.

Round-trip from

$507
(FlightHub)

One-way from

$278
(FlightHub)

Popular in

June

Cheapest in

September

Average price

$833
From Washington to Thailand
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One-way flight from Washington to Thailand
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Highest demand for flights based on searches. 14% potential increase in price ($151 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find flight deals from Washington to Thailand

Cheapest flights from Washington to Thailand
Explore the most affordable flight options available from Washington to Thailand. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 3, 2025.

This Gotogate deal was found by Cheapflights users on 10/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/412:10 amSEA - BKK
1 stop30h 50mAsiana Airlines
Sat 12/611:55 pmBKK - SEA
1 stop29h 00mAsiana Airlines
Deal found 10/31$674
This FlightHub deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/169:30 pmSEA - BKK
1 stop34h 30mPhilippine Airlines
Tue 11/251:20 pmBKK - SEA
1 stop20h 20mPhilippine Airlines
Deal found 11/1$675
This Gotogate deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/312:10 amSEA - BKK
1 stop30h 50mAsiana Airlines
Sun 11/2311:55 pmBKK - SEA
1 stop29h 00mAsiana Airlines
Deal found 11/2$676
This FlightHub deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/279:30 pmSEA - BKK
1 stop34h 30mPhilippine Airlines
Thu 12/41:20 pmBKK - SEA
1 stop20h 20mPhilippine Airlines
Deal found 11/1$678
This FlightHub deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/912:10 amSEA - HKT
1 stop30h 25mAsiana Airlines
Fri 11/2110:15 pmHKT - SEA
1 stop30h 40mAsiana Airlines
Deal found 11/2$678
This CrystalTravel deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/13:40 pmSEA - BKK
1 stop22h 30mANA
Mon 12/87:10 amBKK - SEA
1 stop21h 10mANA
Deal found 11/1$680
This Gotogate deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/412:10 amSEA - BKK
1 stop30h 50mAsiana Airlines
Wed 11/1211:55 pmBKK - SEA
1 stop29h 00mAsiana Airlines
Deal found 11/2$681
This Flightnetwork deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/610:00 amSEA - HKT
1 stop43h 25mHainan Airlines
Fri 12/1910:05 pmHKT - SEA
1 stop24h 55mHainan Airlines
Deal found 11/1$681
This Kiwi.com deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1012:10 amSEA - BKK
1 stop30h 50mAsiana Airlines
Sun 11/2311:55 pmBKK - SEA
1 stop29h 00mAsiana Airlines
Deal found 11/1$683
This FlightHub deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2412:10 amSEA - BKK
1 stop30h 50mAsiana Airlines
Fri 12/511:55 pmBKK - SEA
1 stop29h 00mAsiana Airlines
Deal found 11/1$684
This KAYAK deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/99:30 pmSEA - BKK
1 stop34h 30mPhilippine Airlines
Wed 11/191:20 pmBKK - SEA
1 stop20h 20mPhilippine Airlines
Deal found 11/2$685
This SmartFares deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/210:00 amSEA - BKK
1 stop22h 25mHainan Airlines
Mon 12/81:05 amBKK - SEA
1 stop21h 55mHainan Airlines
Deal found 11/2$686

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington to Thailand that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 3, 2025.
Use the filters below to find and compare flights from Washington to Thailand that are best for you.

Fly from

Washington

Fly to

Thailand

Route

Depart

Return

Price

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Fri 1/16

11:25 am-11:20 pm

1 stop20h 55m

Bangkok Suvarnabhumi

Sun 2/15

9:40 am-1:20 pm

1 stop18h 40m

$695

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Sun 11/30

11:15 am-12:55 am

1 stop22h 40m

Bangkok Suvarnabhumi

Sun 12/7

2:05 am-1:20 pm

1 stop26h 15m

$695

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Sun 11/30

11:15 am-12:45 am

1 stop22h 30m

Bangkok Suvarnabhumi

Sat 12/20

9:40 am-1:20 pm

1 stop18h 40m

$695

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Sun 1/4

11:25 am-12:45 am

1 stop22h 20m

Bangkok Suvarnabhumi

Wed 1/21

2:05 am-1:20 pm

1 stop26h 15m

$695

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Sun 1/4

11:25 am-12:45 am

1 stop22h 20m

Bangkok Suvarnabhumi

Tue 3/31

9:50 am-2:00 pm

1 stop18h 10m

$695

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Tue 12/30

12:10 am-10:00 pm

1 stop30h 50m

Bangkok Suvarnabhumi

Fri 1/23

11:55 pm-1:55 pm

1 stop29h 00m

$696

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Tue 1/13

11:00 am-12:55 am

1 stop22h 55m

Bangkok Suvarnabhumi

Thu 3/12

12:55 am-10:00 am

1 stop23h 05m

$698

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Sun 1/18

11:00 am-12:55 am

1 stop22h 55m

Bangkok Suvarnabhumi

Tue 1/27

2:05 am-9:00 am

1 stop21h 55m

$698

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Wed 1/21

11:00 am-12:55 am

1 stop22h 55m

Bangkok Suvarnabhumi

Thu 2/12

2:05 am-9:00 am

1 stop21h 55m

$698

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Sun 1/25

11:00 am-12:55 am

1 stop22h 55m

Bangkok Suvarnabhumi

Sat 2/7

12:55 am-9:00 am

1 stop23h 05m

$698

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

Showing 1-10 of 60 results
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Best time to book a flight from Washington to Thailand

Have a flexible travel schedule? Discover the best time to fly to Thailand from Washington with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington to Thailand

What is the cheapest month to book a flight from State of Washington to Thailand?

Currently, February is the cheapest month in which you can book a flight from State of Washington to Thailand (average of $517). Flying from State of Washington to Thailand in May is currently the most expensive (average of $735). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from WA to TH?

Find hourly flight availability from Washington to Thailand. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 3, 2025.

One of the essential ways to save on airfare from State of Washington to Thailand is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 42% on airfare.

What is the cheapest day to fly from State of Washington to Thailand?

Use this chart to determine the cheapest time to fly round-trip from Washington to Thailand. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their State of Washington to Thailand flight should consider departing on Monday afternoons when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

Find useful and relevant information for your journey from Washington to Thailand. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from State of Washington to Thailand?

    There are many flights that can get you from State of Washington to Thailand in 20h 10m. Fly via Delta, Asiana Airlines, or Korean Air to get the fastest option. The distance from State of Washington to Thailand is about 7860 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from State of Washington to Thailand one-way?

    The cheapest airlines for a one-way flight from State of Washington to Thailand are Singapore Airlines ($278), Asiana Airlines ($367), and Delta ($372).

  • Can I find deals for flights from Washington to Thailand that include hotel bookings?

    Yes. In addition to deals on Washington to Thailand flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to Thailand?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Thailand.

  • Can I find deals for business class flights from Washington to Thailand?

    Yes. Cheapflights offers flight deals from Washington to Thailand by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from State of Washington to Thailand?

    Currently, February is the cheapest month in which you can book a flight from State of Washington to Thailand (average of $517). Flying from State of Washington to Thailand in May is currently the most expensive (average of $735). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Washington to Thailand

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Washington to Thailand

Discover the top 10 airlines that operate flights from Washington to Thailand. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$433Average$920FlexibilityNo cancel feeOn-timeN/A
Singapore AirlinesCheapest$525Average$943FlexibilityNo cancel feeOn-time81%
Philippine AirlinesCheapest$609Average$711FlexibilityNo cancel feeOn-time60%
Asiana AirlinesCheapest$618Average$761FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$670Average$932FlexibilityNo cancel feeOn-time81%
ANACheapest$703Average$887FlexibilityNo cancel feeOn-time80%
China AirlinesCheapest$730Average$834FlexibilityNo cancel feeOn-time70%
Cathay PacificCheapest$735Average$798FlexibilityNo cancel feeOn-time72%
STARLUX AirlinesCheapest$739Average$861FlexibilityNo cancel feeOn-timeN/A
China EasternCheapest$754Average$903FlexibilityNo cancel feeOn-time62%

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