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Southeast Asia

$266+ Cheap flights from Washington to Southeast Asia

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 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BKK
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheap flight deals from Washington to Southeast Asia

Keep the following information in mind while searching for Washington to Southeast Asia flight deals. Data was last updated September 16, 2025.

Round-trip from

$568
(FlightHub)

One-way from

$266
(FlightHub)

Popular in

December

Cheapest in

April

Average price

$796
From Washington to Southeast Asia
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One-way flight from Washington to Southeast Asia
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Highest demand for flights based on searches. 9% potential increase in price ($93 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($37 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Washington to Southeast Asia

Cheapest flights from Washington to Southeast Asia
Explore the most affordable flight options available from Washington to Southeast Asia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This FlightHub deal was found by Cheapflights users on 9/16. 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.
Tue 10/2110:15 amSEA - SIN
Nonstop16h 20mSingapore Airlines
Thu 10/309:00 amSIN - SEA
Nonstop14h 10mSingapore Airlines
Deal found 9/16$606
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1711:35 pmSEA - SIN
1 stop18h 50mPhilippine Airlines
Wed 10/152:35 pmSIN - SEA
1 stop19h 40mPhilippine Airlines
Deal found 9/15$631
This oojo deal was found by Cheapflights users on 9/14. 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 11/259:30 pmSEA - SIN
1 stop20h 05mPhilippine Airlines
Mon 12/18:10 pmSIN - SEA
1 stop38h 30mPhilippine Airlines
Deal found 9/14$649
This Trip.com deal was found by Cheapflights users on 9/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/309:45 amSEA - SIN
Nonstop17h 00mSingapore Airlines
Thu 11/139:00 amSIN - SEA
Nonstop14h 10mSingapore Airlines
Deal found 9/14$651
This oojo deal was found by Cheapflights users on 9/14. 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.
Fri 10/319:45 amSEA - SIN
Nonstop17h 00mSingapore Airlines
Fri 11/79:00 amSIN - SEA
Nonstop14h 10mSingapore Airlines
Deal found 9/14$653
This Cheapflightsfares deal was found by Cheapflights users on 9/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/311:35 pmSEA - SIN
1 stop28h 20mPhilippine Airlines
Sun 10/122:35 pmSIN - SEA
1 stop19h 40mPhilippine Airlines
Deal found 9/13$655
This FlightHub deal was found by Cheapflights users on 9/14. 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.
Wed 11/269:30 pmSEA - SIN
1 stop34h 10mPhilippine Airlines
Sat 11/2912:40 amSIN - SEA
1 stop34h 00mPhilippine Airlines
Deal found 9/14$657
This oojo deal was found by Cheapflights users on 9/16. 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 10/147:00 amSEA - SIN
1 stop21h 10mMultiple Airlines
Tue 10/219:00 amSIN - SEA
Nonstop14h 45mMultiple Airlines
Deal found 9/16$658
This Gotogate deal was found by Cheapflights users on 9/15. 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 11/1812:10 amSEA - BKK
1 stop30h 55mAsiana Airlines
Sun 11/3011:55 pmBKK - SEA
1 stop29h 00mAsiana Airlines
Deal found 9/15$661
This SmartFares deal was found by Cheapflights users on 9/15. 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 9/302:15 pmSEA - BKK
1 stop18h 55mAsiana Airlines
Thu 10/21:20 amBKK - SEA
1 stop25h 10mAsiana Airlines
Deal found 9/15$663
This Gurufare deal was found by Cheapflights users on 9/16. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2610:30 pmSEA - SIN
1 stop23h 30mPhilippine Airlines
Sat 11/158:10 pmSIN - SEA
1 stop38h 30mPhilippine Airlines
Deal found 9/16$664
This lol.travel deal was found by Cheapflights users on 9/15. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1812:50 pmSEA - BKK
1 stop18h 55mKorean Air
Wed 10/12:35 amBKK - SEA
2 stops27h 31mKorean Air
Deal found 9/15$665

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington to Southeast Asia 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 September 16, 2025.
Use the filters below to find and compare flights from Washington to Southeast Asia that are best for you.

Fly from

Washington

Fly to

Southeast Asia

Route

Depart

Return

Price

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Mon 2/2

12:10 am-10:05 pm

1 stop30h 55m

Bangkok Suvarnabhumi

Tue 2/10

11:55 pm-1:55 pm

1 stop29h 00m

$680

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Sat 2/7

12:10 am-10:05 pm

1 stop30h 55m

Bangkok Suvarnabhumi

Wed 2/11

12:20 pm-1:55 pm

1 stop16h 35m

$680

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Sun 10/5

11:35 pm-1:20 pm

1 stop22h 45m

Singapore Changi

Tue 10/7

12:20 am-7:15 pm

1 stop33h 55m

$682

SeattleHo Chi Minh City

SEA - SGN

SEASGN

Seattle/Tacoma Intl

Wed 11/19

11:00 am-10:25 pm

1 stop20h 25m

Ho Chi Minh City

Wed 12/10

11:50 pm-9:00 am

1 stop24h 10m

$694

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Mon 2/2

12:10 am-11:15 am

1 stop20h 05m

Bangkok Suvarnabhumi

Sat 2/14

11:55 pm-1:55 pm

1 stop29h 00m

$697

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Mon 9/29

2:15 pm-11:10 pm

1 stop18h 55m

Bangkok Suvarnabhumi

Wed 10/15

11:55 am-12:30 pm

1 stop38h 35m

$697

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Tue 10/28

12:00 pm-9:30 pm

1 stop19h 30m

Bangkok Suvarnabhumi

Wed 11/12

12:55 am-9:00 am

1 stop23h 05m

$699

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Sun 11/2

9:30 pm-10:45 pm

1 stop34h 15m

Bangkok Suvarnabhumi

Tue 11/18

11:35 pm-6:40 pm

1 stop34h 05m

$703

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Mon 10/20

7:25 am-1:05 am

2 stops27h 40m

Bangkok Suvarnabhumi

Wed 11/19

12:55 am-9:00 am

1 stop23h 05m

$704

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Tue 11/4

5:55 pm-9:30 pm

2 stops36h 35m

Bangkok Suvarnabhumi

Mon 11/17

12:55 am-9:00 am

1 stop23h 05m

$704

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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

Have a flexible travel schedule? Discover the best time to fly to Southeast Asia 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 Southeast Asia

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

Currently, September is the cheapest month in which you can book a flight from State of Washington to Southeast Asia (average of $900). Flying from State of Washington to Southeast Asia in December is currently the most expensive (average of $1,507). 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 YJX?

Find hourly flight availability from Washington to Southeast Asia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from State of Washington to Southeast Asia as you normally would.

Related info for your journey

Find useful and relevant information for your journey from Washington to Southeast Asia. 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 Southeast Asia?

    A quick flight from State of Washington to Southeast Asia can take about 20h 25m. Asiana Airlines provides one of the quickest options available for as low as $694. The distance between State of Washington and Southeast Asia is about 7410 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 Southeast Asia one-way?

    For one-way options, check prices for Philippine Airlines. According to our data, you can fly for as low as $303. Users have also found prices from $309 and $348 on Singapore Airlines and Asiana Airlines, respectively.

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

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

  • How can I find direct flights from Washington to Southeast Asia?

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

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

    Yes. Cheapflights offers flight deals from Washington to Southeast Asia 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 Southeast Asia?

    Currently, September is the cheapest month in which you can book a flight from State of Washington to Southeast Asia (average of $900). Flying from State of Washington to Southeast Asia in December is currently the most expensive (average of $1,507). 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

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Alternative routes for Washington to Southeast Asia

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 Southeast Asia

Discover the top 10 airlines that operate flights from Washington to Southeast Asia. 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$433Average$948FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$459Average$995FlexibilityNo cancel feeOn-time69%
Singapore AirlinesCheapest$509Average$944FlexibilityNo cancel feeOn-time81%
Philippine AirlinesCheapest$605Average$906FlexibilityNo cancel feeOn-time60%
Cathay PacificCheapest$622Average$1,910FlexibilityNo cancel feeOn-time72%
Asiana AirlinesCheapest$628Average$843FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$673Average$999FlexibilityNo cancel feeOn-time81%
Air CanadaCheapest$684Average$1,088FlexibilityNo cancel feeOn-time67%
Japan AirlinesCheapest$687Average$977FlexibilityNo cancel feeOn-time79%
ANACheapest$688Average$909FlexibilityNo cancel feeOn-time80%

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