$495 Cheap Flights from Washington (IAD) to Singapore (SIN)

View $495 flight on Wed, Oct 1, 2025Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Singapore Changi Airport (SIN)

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Cheap Flights from Washington to Singapore (IAD-SIN)

Prices were available within the past 7 days and start at $495 for one-way flights and $902 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air India
Sun, Mar 1 - Mon, Mar 23
IAD
Washington
SIN
Singapore
$902 Roundtrip, found 5 days ago
$902
Roundtrip
found 5 days ago
Select Air India flight, departing Sun, Mar 1 from Washington to Singapore, returning Mon, Mar 23, priced at $902 found 5 days ago
Etihad Airways
Sat, Nov 8 - Mon, Nov 17
IAD
Washington
SIN
Singapore
$931 Roundtrip, found 5 hours ago
$931
Roundtrip
found 5 hours ago
Select Etihad Airways flight, departing Sat, Nov 8 from Washington to Singapore, returning Mon, Nov 17, priced at $931 found 5 hours ago
Korean Air
Mon, Nov 3 - Mon, Nov 10
IAD
Washington
SIN
Singapore
$994 Roundtrip, found 1 day ago
$994
Roundtrip
found 1 day ago
Select Korean Air flight, departing Mon, Nov 3 from Washington to Singapore, returning Mon, Nov 10, priced at $994 found 1 day ago
Singapore Airlines
Thu, Jan 15 - Tue, Jan 27
IAD
Washington
SIN
Singapore
$1,040 Roundtrip, found 12 hours ago
$1,040
Roundtrip
found 12 hours ago
Select Singapore Airlines flight, departing Thu, Jan 15 from Washington to Singapore, returning Tue, Jan 27, priced at $1,040 found 12 hours ago
Turkish Airlines
Wed, Feb 11 - Wed, Feb 18
IAD
Washington
SIN
Singapore
$1,101 Roundtrip, found 1 day ago
$1,101
Roundtrip
found 1 day ago
Select Turkish Airlines flight, departing Wed, Feb 11 from Washington to Singapore, returning Wed, Feb 18, priced at $1,101 found 1 day ago
Air Canada
Tue, Jan 20 - Tue, Jan 27
IAD
Washington
SIN
Singapore
$1,119 Roundtrip, found 4 days ago
$1,119
Roundtrip
found 4 days ago
Select Air Canada flight, departing Tue, Jan 20 from Washington to Singapore, returning Tue, Jan 27, priced at $1,119 found 4 days ago
Qatar Airways
Tue, Nov 11 - Wed, Nov 19
IAD
Washington
SIN
Singapore
$1,203 Roundtrip, found 5 hours ago
$1,203
Roundtrip
found 5 hours ago
Select Qatar Airways flight, departing Tue, Nov 11 from Washington to Singapore, returning Wed, Nov 19, priced at $1,203 found 5 hours ago
United
Mon, Nov 3 - Mon, Nov 10
IAD
Washington
SIN
Singapore
$1,225 Roundtrip, found 1 day ago
$1,225
Roundtrip
found 1 day ago
Select United flight, departing Mon, Nov 3 from Washington to Singapore, returning Mon, Nov 10, priced at $1,225 found 1 day ago
Delta
Mon, Nov 3 - Mon, Nov 10
IAD
Washington
SIN
Singapore
$1,240 Roundtrip, found 1 day ago
$1,240
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, Nov 3 from Washington to Singapore, returning Mon, Nov 10, priced at $1,240 found 1 day ago
Ethiopian Airlines
Thu, Jul 31 - Sat, Sep 27
IAD
Washington
SIN
Singapore
$1,248 Roundtrip, found 2 days ago
$1,248
Roundtrip
found 2 days ago
Select Ethiopian Airlines flight, departing Thu, Jul 31 from Washington to Singapore, returning Sat, Sep 27, priced at $1,248 found 2 days ago

Find the cheapest month to fly from Washington (IAD) to Singapore (SIN)

September is typically the cheapest month to fly

From $701 - $1,151 per traveler.

Graph displaying average flight prices per month

Alternative airports near Singapore

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

Select flight to Senai Intl. JHB. Average driving time to city center is 48 minutes. Flights from $1,792
JHB
Senai Intl.
Average driving time to city center48 min
Flights from $1,792
Flights from Washington (IAD) to Singapore (SIN)
Origin airport
Washington Dulles Intl.
Destination airport
Changi
Airlines serving
Air Canada, Air France, Air India, Alaska Airlines, All Nippon Airways, American Airlines, British Airways, Delta, Emirates, Etihad Airways, JetBlue Airways, KLM, Korean Air, Lufthansa, Malaysia Airlines, Qatar Airways, Singapore Airlines, Swiss International Air Lines, Turkish Airlines, United
Roundtrip price
$901
Distance
9649 mi

Washington to Singapore Flights

The cheapest times to fly from Washington to Singapore

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 Washington to Singapore are during the month of March. You can find some of the cheapest flights from Washington to Singapore with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Singapore

Sunday is one of the best days to book for cheap flights from Washington to Singapore: 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 Washington to Singapore

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 Washington to Singapore in 2025. You can also book with separate airlines for your outbound and return journeys, from $495 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 Washington to Singapore 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 Washington to Singapore 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 Washington Dulles Intl. Airport (IAD) to Changi Airport (SIN) cost?
Discover the latest flight deals from IAD to SIN 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 IAD to SIN?
The cheapest flights from IAD to SIN 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 IAD to SIN?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from IAD to SIN. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Changi Airport (SIN)?
There aren't any daily direct flights available from Washington Dulles Intl. Airport (IAD) to Changi Airport (SIN). But you can opt for flights with layovers. Filter your search results 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 IAD to SIN?
Typically you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can vary depending on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Changi Airport (SIN)?
To reach Changi Airport (SIN) on schedule, select a flight that leaves from Washington Dulles Intl. Airport (IAD) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**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 Washington Dulles Intl. Airport (IAD) to Changi Airport (SIN) last-minute?
Waiting until just before your departure to book your flight from IAD to SIN generally means paying more. While you might find some last-minute offers, they aren't always guaranteed. Be flexible with your itinerary to maximize your chances of landing a bargain.
Is it cheaper to book an IAD to SIN flight and hotel package?
Opting for an IAD to SIN flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Pick from our wide range of accommodations and then add activities, flights and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Changi Airport (SIN)?
If you booked your IAD to SIN flight in the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the type of fare you have, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you want more information.

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*Available to One Key members.