$426 Cheap Flights from Washington (IAD) to Bangkok (BKK)

View $426 flight on Fri, Jan 23, 2026Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Suvarnabhumi Intl. Airport (BKK)

Cheap Flights from Washington to Bangkok (IAD-BKK)

Prices were available within the past 7 days and start at $426 for one-way flights and $778 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Mon, Feb 16 - Wed, Mar 11
IAD
Washington
BKK
Bangkok
$778 Roundtrip, found 20 hours ago
$778
Roundtrip
found 20 hours ago
Select TAP Portugal flight, departing Mon, Feb 16 from Washington to Bangkok, returning Wed, Mar 11, priced at $778 found 20 hours ago
Etihad Airways
Sun, Nov 30 - Sat, Dec 20
IAD
Washington
BKK
Bangkok
$835 Roundtrip, just found
$835
Roundtrip
just found
Select Etihad Airways flight, departing Sun, Nov 30 from Washington to Bangkok, returning Sat, Dec 20, priced at $835 just found
Turkish Airlines
Tue, Mar 3 - Wed, Mar 25
IAD
Washington
BKK
Bangkok
$893 Roundtrip, found 8 hours ago
$893
Roundtrip
found 8 hours ago
Select Turkish Airlines flight, departing Tue, Mar 3 from Washington to Bangkok, returning Wed, Mar 25, priced at $893 found 8 hours ago
Alaska Airlines
Wed, Mar 18 - Wed, Apr 29
IAD
Washington
BKK
Bangkok
$901 Roundtrip, found 2 hours ago
$901
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Wed, Mar 18 from Washington to Bangkok, returning Wed, Apr 29, priced at $901 found 2 hours ago
ITA Airways
Thu, Mar 5 - Wed, Mar 11
IAD
Washington
BKK
Bangkok
$910 Roundtrip, just found
$910
Roundtrip
just found
Select ITA Airways flight, departing Thu, Mar 5 from Washington to Bangkok, returning Wed, Mar 11, priced at $910 just found
Korean Air
Mon, Dec 1 - Mon, Dec 8
IAD
Washington
BKK
Bangkok
$917 Roundtrip, just found
$917
Roundtrip
just found
Select Korean Air flight, departing Mon, Dec 1 from Washington to Bangkok, returning Mon, Dec 8, priced at $917 just found
STARLUX Airlines
Tue, Mar 31 - Thu, Apr 30
IAD
Washington
BKK
Bangkok
$922 Roundtrip, just found
$922
Roundtrip
just found
Select STARLUX Airlines flight, departing Tue, Mar 31 from Washington to Bangkok, returning Thu, Apr 30, priced at $922 just found
Qatar Airways
Wed, Jan 14 - Wed, Jan 21
IAD
Washington
BKK
Bangkok
$923 Roundtrip, just found
$923
Roundtrip
just found
Select Qatar Airways flight, departing Wed, Jan 14 from Washington to Bangkok, returning Wed, Jan 21, priced at $923 just found
JetBlue Airways
Wed, Jan 14 - Thu, Jan 22
IAD
Washington
BKK
Bangkok
$923 Roundtrip, just found
$923
Roundtrip
just found
Select JetBlue Airways flight, departing Wed, Jan 14 from Washington to Bangkok, returning Thu, Jan 22, priced at $923 just found
United
Tue, Aug 11 - Tue, Aug 25
IAD
Washington
BKK
Bangkok
$932 Roundtrip, found 16 hours ago
$932
Roundtrip
found 16 hours ago
Select United flight, departing Tue, Aug 11 from Washington to Bangkok, returning Tue, Aug 25, priced at $932 found 16 hours ago

Find the cheapest month to fly from Washington (IAD) to Bangkok (BKK)

March is typically the cheapest month to fly

From $781 - $1,556 per traveler.

Alternative airports near Bangkok

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

Select flight to Don Mueang Intl. DMK. Closest option available. Average driving time to city center is 19 minutes. Flights from $1,515
DMK
Don Mueang Intl.
Closest
Average driving time to city center19 min
Flights from $1,515
Flights from Washington (IAD) to Bangkok (BKK)
Origin airport
Washington Dulles Intl.
Destination airport
Suvarnabhumi Intl.
Airlines serving
Air France, Alaska Airlines, All Nippon Airways, American Airlines, Austrian Airlines, British Airways, Delta, Emirates, Etihad Airways, JetBlue Airways, KLM, Korean Air, Lufthansa, Qatar Airways, STARLUX Airlines, SriLankan Airlines, Swiss International Air Lines, Thai Airways International, Turkish Airlines, United
Roundtrip price
$777
Distance
8797 mi

Washington to Bangkok Flights

The cheapest times to fly from Washington to Bangkok

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

 

The best time to book a flight from Washington to Bangkok

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

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 Bangkok in 2025. You can also book with separate airlines for your outbound and return journeys, from $426 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 Bangkok 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 Bangkok 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 Suvarnabhumi Intl. Airport (BKK) cost?
Lock in a cheap one-way flight from $426 or cheap return flight from $778 from Washington Dulles Intl. Airport (IAD) to Suvarnabhumi Intl. Airport (BKK) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Suvarnabhumi Intl. Airport (BKK)?
Planning your trip for February can help you save, as it's the cheapest month for flights between IAD and BKK. You'll usually find the lowest fares during the off-season.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Suvarnabhumi Intl. Airport (BKK)?
Use the filters on Expedia to compare airlines and find the cheapest carrier that'll fly you from IAD to BKK. Then, sort your results by "Price (lowest to highest)" to score the best deal available.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Suvarnabhumi Intl. Airport (BKK)?
There aren't any daily direct flights departing from Washington Dulles Intl. Airport (IAD) to Suvarnabhumi Intl. Airport (BKK). But you can choose flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be on your way in no time.
What day of the week has the most flights from IAD to BKK?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can change depending on a range of factors, including the time of year and airline.*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 Suvarnabhumi Intl. Airport (BKK)?
To avoid potential delays on the Washington Dulles Intl. Airport (IAD) to Suvarnabhumi Intl. Airport (BKK) route, aim to fly before 3 PM. Later flights are 22% more likely to be canceled.**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 Suvarnabhumi Intl. Airport (BKK) last-minute?
Waiting until just before your departure to book a ticket from IAD to BKK generally means paying more. While you might find some last-minute offers, they're not always guaranteed. Be flexible with your travel plans to boost your chances of getting a bargain.
Is it cheaper to book an IAD to BKK flight and hotel package?
Opting for an IAD to BKK flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip all in one place. Select from our extensive range of hotels and then add activities, car rentals and flights to your booking. Bundle it all 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 Suvarnabhumi Intl. Airport (BKK)?
In most cases, you can cancel or modify your IAD to BKK flight. However, there may be additional charges, especially if you booked over 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you need further details, go to our Customer Service portal.

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*Available to One Key members.