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$258+ Cheap flights from Washington to Singapore (SIN)

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 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SIN
Dec 2 — Dec 91
Tue 12/2
Tue 12/9
1 adult, Economy
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Find flight deals from Washington to Singapore

Cheapest flights from Washington to Singapore
Explore the most affordable flight options available from Washington to Singapore. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 2, 2025.

This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1612:10 amSEA - SIN
1 stop29h 45mAsiana Airlines
Wed 11/2611:10 pmSIN - SEA
1 stop30h 45mAsiana Airlines
Deal found 10/31$708
This oojo deal was found by Cheapflights users on 10/30. 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.
Sun 11/1612:10 amSEA - SIN
1 stop29h 45mAsiana Airlines
Fri 11/2111:10 pmSIN - SEA
1 stop30h 45mAsiana Airlines
Deal found 10/30$729
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/193:40 pmSEA - SIN
2 stops27h 35mAir Canada
Thu 11/278:50 amSIN - SEA
1 stop21h 41mAir Canada
Deal found 10/31$737
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/23:40 pmSEA - SIN
2 stops27h 35mAir Canada
Tue 12/99:00 pmSIN - SEA
2 stops28h 31mAir Canada
Deal found 10/31$738
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1812:10 amSEA - SIN
1 stop29h 45mAsiana Airlines
Sun 11/3011:10 pmSIN - SEA
1 stop30h 45mAsiana Airlines
Deal found 11/2$739
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/198:00 pmSEA - SIN
2 stops23h 15mAir Canada
Wed 11/2611:10 pmSIN - SEA
2 stops31h 21mAir Canada
Deal found 10/31$754
This Gotogate 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/111:00 amSEA - SIN
1 stop21h 10mKorean Air
Wed 12/1010:30 pmSIN - SEA
1 stop26h 30mKorean Air
Deal found 11/1$756
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/39:05 amSEA - SIN
2 stops30h 55mUnited Airlines
Wed 12/1010:10 amSIN - SEA
1 stop21h 19mUnited Airlines
Deal found 11/1$760
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/13:37 pmSEA - SIN
1 stop36h 38mUnited Airlines
Tue 12/910:20 pmSIN - SEA
1 stop18h 30mUnited Airlines
Deal found 11/1$762
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/113:40 pmSEA - SIN
1 stop23h 20mAir Canada
Sat 11/228:50 amSIN - SEA
1 stop16h 41mAir Canada
Deal found 11/1$765
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/168:00 pmSEA - SIN
2 stops23h 15mAir Canada
Tue 11/258:50 amSIN - SEA
1 stop21h 41mAir Canada
Deal found 10/31$767
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/17:38 pmPDX - SIN
2 stops44h 22mMultiple Airlines
Sun 11/168:50 amSIN - PDX
1 stop16h 25mMultiple Airlines
Deal found 10/31$809

Cheap flight deals from Washington to Singapore

Keep the following information in mind while searching for Washington to Singapore flight deals. Data was last updated November 2, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$706
(oojo)

One-way from

$258
(IEagle)

Popular in

December

Cheapest in

September

Average price

$863

Good round-trip deal

$708 or less

Good one-way deal

$306 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Singapore Changi flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Singapore Changi flights.
Search Deals
From Washington to Singapore Changi
Search Deals
One-way flight from Washington to Singapore Changi
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($154 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($61 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from Washington to Singapore Changi.
Search Deals
Price to beat on a one-way flight from Washington to Singapore Changi.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington to Singapore 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 2, 2025.
Use the filters below to find and compare flights from Washington to Singapore that are best for you.

Fly from

Washington

Fly to

Singapore

Route

Depart

Return

Price

PortlandSingapore

PDX - SIN

PDXSIN

Portland

Thu 1/22

9:50 am-7:00 am

1 stop29h 10m

Singapore Changi

Sun 1/25

9:00 pm-9:15 am

2 stops28h 15m

$744

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Sat 1/31

12:10 am-9:55 pm

1 stop29h 45m

Singapore Changi

Tue 2/10

11:10 pm-1:55 pm

1 stop30h 45m

$759

PortlandSingapore

PDX - SIN

PDXSIN

Portland

Tue 3/31

9:50 am-5:00 am

2 stops28h 10m

Singapore Changi

Thu 4/16

8:50 pm-9:15 am

2 stops27h 25m

$767

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Tue 1/13

11:00 am-12:10 am

1 stop21h 10m

Singapore Changi

Sun 2/1

10:30 pm-9:00 am

1 stop26h 30m

$803

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Tue 1/13

5:12 pm-8:15 pm

2 stops35h 03m

Singapore Changi

Mon 1/26

10:45 am-1:20 pm

1 stop18h 35m

$804

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Thu 1/22

7:15 am-8:25 pm

2 stops45h 10m

Singapore Changi

Wed 1/28

1:35 am-9:00 am

1 stop23h 25m

$809

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Tue 1/13

7:15 am-8:25 pm

2 stops45h 10m

Singapore Changi

Tue 1/20

10:30 pm-2:55 pm

2 stops32h 25m

$820

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Wed 1/14

6:03 am-12:55 am

2 stops26h 52m

Singapore Changi

Wed 1/21

10:45 am-9:12 pm

3 stops26h 27m

$823

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Sun 11/16

7:13 pm-8:15 pm

2 stops33h 02m

Singapore Changi

Thu 11/20

10:10 am-9:13 pm

3 stops27h 03m

$831

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Wed 1/14

7:15 am-8:25 pm

2 stops45h 10m

Singapore Changi

Sat 1/31

1:35 am-9:00 am

1 stop23h 25m

$847

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

Showing 1-10 of 46 results
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Best time to book a flight from Washington to Singapore

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

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

Currently, September is the cheapest month in which you can book a flight from State of Washington to Singapore (average of $547). Flying from State of Washington to Singapore in December is currently the most expensive (average of $810). 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 SIN?

Find hourly flight availability from Washington to Singapore. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 2, 2025.

When flying from State of Washington to Singapore, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 5% versus a flight at noon.

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

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

Travelers seeking maximum savings on their State of Washington to Singapore flight should consider departing on Saturday afternoons when fares are most often at their lowest. Saturday evenings 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 Singapore. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Singapore from Washington?

    If you book a flight to Singapore from Washington, you will be flying to Changi, which is the city’s only airport. Singapore Changi (SIN) is located 10.5 mi from the center of Singapore.

  • How popular is this State of Washington to Singapore flight route?

    The Washington to Singapore Changi flight path was viewed by 101 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    There are many flights that can get you from State of Washington to Singapore in 21h 10m. Fly via Air Canada, Asiana Airlines, or Korean Air to get the fastest option. State of Washington and Singapore are separated by a distance of 8059 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 Singapore one-way?

    The cheapest airlines for a one-way flight from State of Washington to Singapore are Singapore Airlines ($258), Philippine Airlines ($327), and Asiana Airlines ($368).

  • What are the most popular routes from State of Washington to Singapore?

    While some choose either Portland - Singapore Changi or Spokane - Singapore Changi, Seattle/Tacoma Intl - Singapore Changi is the most popular route from State of Washington to Singapore.

  • What are the cheapest flights from State of Washington to Singapore?

    The cheapest flight price from State of Washington to Singapore is $277. On average you can expect to pay $2,170. The most popular route, (Seattle/Tacoma Intl - Singapore Changi), can usually be booked for $586.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington to Singapore 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 Singapore?

    Currently, September is the cheapest month in which you can book a flight from State of Washington to Singapore (average of $547). Flying from State of Washington to Singapore in December is currently the most expensive (average of $810). 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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Top 10 airlines flying from Washington to Singapore

Discover the top 10 airlines that operate flights from Washington to Singapore. 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 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
Singapore AirlinesCheapest$596Average$856FlexibilityNo cancel feeOn-time81%
Philippine AirlinesCheapest$650Average$706FlexibilityNo cancel feeOn-time60%
Asiana AirlinesCheapest$662Average$788FlexibilityNo cancel feeOn-time76%
Japan AirlinesCheapest$687Average$793FlexibilityNo cancel feeOn-time79%
Air CanadaCheapest$712Average$875FlexibilityNo cancel feeOn-time67%
ANACheapest$718Average$1,127FlexibilityNo cancel feeOn-time80%
United AirlinesCheapest$724Average$888FlexibilityNo cancel feeOn-time69%
Korean AirCheapest$736Average$972FlexibilityNo cancel feeOn-time81%
DeltaCheapest$750Average$948FlexibilityNo cancel feeOn-timeN/A
China AirlinesCheapest$933Average$1,169FlexibilityNo cancel feeOn-time70%

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