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$330+ 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 4/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BKK
May 3 — May 101
Sun 5/3
Sun 5/10
1 adult, Economy
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Cheap 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 April 3, 2026.

This oojo deal was found by Cheapflights users on 3/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/110:15 am
SEA
-
BKK
1 stop41h 00m
Singapore Airlines
Thu 10/229:20 am
BKK
-
SEA
1 stop37h 25m
Singapore Airlines
Deal found 3/30$616
This oojo deal was found by Cheapflights users on 3/31. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1310:15 am
SEA
-
BKK
1 stop41h 00m
Singapore Airlines
Thu 10/299:35 am
BKK
-
SEA
1 stop36h 35m
Singapore Airlines
Deal found 3/31$617
This oojo deal was found by Cheapflights users on 3/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2210:15 am
SEA
-
BKK
1 stop41h 00m
Singapore Airlines
Thu 11/59:35 am
BKK
-
SEA
1 stop36h 35m
Singapore Airlines
Deal found 3/29$633
This oojo deal was found by Cheapflights users on 4/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1310:15 am
SEA
-
BKK
1 stop42h 45m
Singapore Airlines
Fri 10/239:20 am
BKK
-
SEA
1 stop37h 25m
Singapore Airlines
Deal found 4/2$637
This FlightHub deal was found by Cheapflights users on 3/30. 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 10/110:15 am
SEA
-
BKK
1 stop31h 50m
Singapore Airlines
Thu 11/199:10 pm
BKK
-
SEA
1 stop25h 00m
Singapore Airlines
Deal found 3/30$640
This oojo deal was found by Cheapflights users on 4/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/110:15 am
SEA
-
BKK
1 stop41h 00m
Singapore Airlines
Thu 10/299:35 am
BKK
-
SEA
1 stop36h 35m
Singapore Airlines
Deal found 4/2$646
This oojo deal was found by Cheapflights users on 3/31. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2210:15 am
SEA
-
BKK
1 stop31h 50m
Singapore Airlines
Mon 11/169:10 pm
BKK
-
SEA
1 stop25h 00m
Singapore Airlines
Deal found 3/31$647
This oojo deal was found by Cheapflights users on 3/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1710:15 am
SEA
-
BKK
1 stop41h 00m
Singapore Airlines
Sat 10/241:35 pm
BKK
-
SEA
1 stop32h 35m
Singapore Airlines
Deal found 3/30$649
This FlightHub deal was found by Cheapflights users on 3/30. 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.
Sat 9/510:15 am
SEA
-
HKT
1 stop32h 20m
Singapore Airlines
Sat 9/198:50 pm
HKT
-
SEA
1 stop25h 55m
Singapore Airlines
Deal found 3/30$649
This FlightHub deal was found by Cheapflights users on 3/31. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2210:15 am
SEA
-
HKT
1 stop34h 35m
Singapore Airlines
Thu 9/32:15 pm
HKT
-
SEA
1 stop32h 30m
Singapore Airlines
Deal found 3/31$658
This oojo deal was found by Cheapflights users on 4/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2210:15 am
SEA
-
HKT
1 stop37h 55m
Singapore Airlines
Thu 10/298:40 am
HKT
-
SEA
1 stop37h 30m
Singapore Airlines
Deal found 4/2$665
This oojo deal was found by Cheapflights users on 3/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1010:15 am
SEA
-
HKT
1 stop32h 05m
Singapore Airlines
Mon 10/268:15 pm
HKT
-
SEA
1 stop25h 55m
Singapore Airlines
Deal found 3/29$676

Find flight deals from Washington to Thailand

Keep the following information in mind while searching for Washington to Thailand flight deals. Data was last updated April 3, 2026.

Round-trip from

$649
(FlightHub)

One-way from

$330
(FlightHub)

Popular in

June

Cheapest in

September

Average price

$816
From Washington to Thailand
Search Deals
One-way flight from Washington to Thailand
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($146 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

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 April 3, 2026.
Use the filters below to find and compare flights from Washington to Thailand that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandChiang Mai

PDX - CNX

PDXCNX

Portland

Fri 9/11

1:50 pm-10:20 am

2 stops30h 30m

Chiang Mai

Sun 9/20

11:20 am-8:50 pm

2 stops47h 30m

$924

PortlandChiang Mai

PDX - CNX

PDXCNX

Portland

Fri 9/11

7:50 pm-10:20 am

2 stops24h 30m

Chiang Mai

Sun 9/20

11:20 am-9:25 am

2 stops36h 05m

$949

SpokaneBangkok

GEG - BKK

GEGBKK

Spokane

Wed 9/30

7:02 am-9:35 am

2 stops36h 33m

Bangkok Suvarnabhumi

Thu 12/10

4:55 pm-11:38 pm

2 stops21h 43m

$954

PortlandBangkok

PDX - BKK

PDXBKK

Portland

Thu 9/10

1:14 pm-9:35 am

3 stops30h 21m

Bangkok Suvarnabhumi

Tue 10/20

7:00 am-2:17 pm

2 stops21h 17m

$966

SpokaneBangkok

GEG - BKK

GEGBKK

Spokane

Wed 9/30

2:02 pm-10:55 am

2 stops30h 53m

Bangkok Suvarnabhumi

Mon 10/19

1:35 am-4:08 pm

2 stops28h 33m

$974

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Fri 4/24

10:40 pm-12:05 am

2 stops59h 25m

Bangkok Suvarnabhumi

Fri 5/1

3:20 pm-10:31 pm

2 stops45h 11m

$975

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Thu 4/30

12:50 pm-1:35 pm

1 stop34h 45m

Bangkok Suvarnabhumi

Sun 5/31

11:30 pm-11:00 am

1 stop25h 30m

$978

SpokaneBangkok

GEG - BKK

GEGBKK

Spokane

Tue 5/5

12:25 pm-9:35 am

2 stops31h 10m

Bangkok Suvarnabhumi

Tue 6/9

3:45 pm-10:27 am

2 stops32h 42m

$994

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Sat 9/19

1:30 am-10:25 am

1 stop18h 55m

Chiang Mai

Wed 9/23

11:35 am-7:40 pm

1 stop22h 05m

$995

PortlandChiang Mai

PDX - CNX

PDXCNX

Portland

Sat 4/25

7:18 pm-10:25 am

2 stops25h 07m

Chiang Mai

Sun 5/10

11:35 am-4:22 pm

2 stops42h 47m

$1,005

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 60 resultsSorted by cheapest first
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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, May is the cheapest month in which you can book a flight from State of Washington to Thailand (average of $501). Flying from State of Washington to Thailand in June is currently the most expensive (average of $744). 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 April 3, 2026.

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 morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 49% 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 March 30, 2025.

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 24h 30m. Fly via China Airlines, United Airlines, or SAUDIA to get the fastest option. The distance from State of Washington to Thailand is about 7279 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 ($277), Philippine Airlines ($301), and Asiana Airlines ($348).

  • 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, May is the cheapest month in which you can book a flight from State of Washington to Thailand (average of $501). Flying from State of Washington to Thailand in June is currently the most expensive (average of $744). 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 April 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
Philippine AirlinesCheapest$149Average$682FlexibilityNo cancel feeOn-time60%
Korean AirCheapest$418Average$876FlexibilityNo cancel feeOn-time81%
Singapore AirlinesCheapest$510Average$911FlexibilityNo cancel feeOn-time81%
DeltaCheapest$544Average$909FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$623Average$1,882FlexibilityNo cancel feeOn-time67%
Asiana AirlinesCheapest$627Average$800FlexibilityNo cancel feeOn-time76%
ANACheapest$680Average$852FlexibilityNo cancel feeOn-time80%
United AirlinesCheapest$700Average$922FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$704Average$798FlexibilityNo cancel feeOn-time72%
China AirlinesCheapest$714Average$813FlexibilityNo cancel feeOn-time70%

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