$640 Cheap Flights from Washington (IAD) to Chiang Rai (CEI)

View $640 flight on Wed, Feb 11, 2026Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Chiang Rai Intl. Airport (CEI)

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Cheap Flights from Washington to Chiang Rai (IAD-CEI)

Prices were available within the past 7 days and start at $640 for one-way flights and $1,029 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Qatar Airways
Sun, Nov 2 - Thu, Nov 6
IAD
Washington
CEI
Chiang Rai
$1,029 Roundtrip, found 13 hours ago
$1,029
Roundtrip
found 13 hours ago
Select Qatar Airways flight, departing Sun, Nov 2 from Washington to Chiang Rai, returning Thu, Nov 6, priced at $1,029 found 13 hours ago
Qatar Airways
Sun, Nov 2 - Thu, Nov 6
IAD
Washington
CEI
Chiang Rai
$1,032 Roundtrip, found 13 hours ago
$1,032
Roundtrip
found 13 hours ago
Select Qatar Airways flight, departing Sun, Nov 2 from Washington to Chiang Rai, returning Thu, Nov 6, priced at $1,032 found 13 hours ago
Qatar Airways
Mon, Nov 3 - Fri, Nov 7
IAD
Washington
CEI
Chiang Rai
$1,033 Roundtrip, found 13 hours ago
$1,033
Roundtrip
found 13 hours ago
Select Qatar Airways flight, departing Mon, Nov 3 from Washington to Chiang Rai, returning Fri, Nov 7, priced at $1,033 found 13 hours ago
Qatar Airways
Sun, Oct 26 - Thu, Oct 30
IAD
Washington
CEI
Chiang Rai
$1,034 Roundtrip, found 14 hours ago
$1,034
Roundtrip
found 14 hours ago
Select Qatar Airways flight, departing Sun, Oct 26 from Washington to Chiang Rai, returning Thu, Oct 30, priced at $1,034 found 14 hours ago
Qatar Airways
Thu, Nov 6 - Mon, Nov 10
IAD
Washington
CEI
Chiang Rai
$1,036 Roundtrip, found 13 hours ago
$1,036
Roundtrip
found 13 hours ago
Select Qatar Airways flight, departing Thu, Nov 6 from Washington to Chiang Rai, returning Mon, Nov 10, priced at $1,036 found 13 hours ago
Qatar Airways
Mon, Nov 3 - Fri, Nov 7
IAD
Washington
CEI
Chiang Rai
$1,037 Roundtrip, found 13 hours ago
$1,037
Roundtrip
found 13 hours ago
Select Qatar Airways flight, departing Mon, Nov 3 from Washington to Chiang Rai, returning Fri, Nov 7, priced at $1,037 found 13 hours ago
Qatar Airways
Thu, Nov 6 - Mon, Nov 10
IAD
Washington
CEI
Chiang Rai
$1,038 Roundtrip, found 13 hours ago
$1,038
Roundtrip
found 13 hours ago
Select Qatar Airways flight, departing Thu, Nov 6 from Washington to Chiang Rai, returning Mon, Nov 10, priced at $1,038 found 13 hours ago
Qatar Airways
Thu, Nov 6 - Mon, Nov 10
IAD
Washington
CEI
Chiang Rai
$1,040 Roundtrip, found 13 hours ago
$1,040
Roundtrip
found 13 hours ago
Select Qatar Airways flight, departing Thu, Nov 6 from Washington to Chiang Rai, returning Mon, Nov 10, priced at $1,040 found 13 hours ago
Qatar Airways
Thu, Nov 6 - Mon, Nov 10
IAD
Washington
CEI
Chiang Rai
$1,042 Roundtrip, found 13 hours ago
$1,042
Roundtrip
found 13 hours ago
Select Qatar Airways flight, departing Thu, Nov 6 from Washington to Chiang Rai, returning Mon, Nov 10, priced at $1,042 found 13 hours ago
Lufthansa
Sun, Apr 19 - Thu, May 28
IAD
Washington
CEI
Chiang Rai
$1,689 Roundtrip, found 2 days ago
$1,689
Roundtrip
found 2 days ago
Select Lufthansa flight, departing Sun, Apr 19 from Washington to Chiang Rai, returning Thu, May 28, priced at $1,689 found 2 days ago
Flights from Washington (IAD) to Chiang Rai (CEI)
Origin airport
Washington Dulles Intl.
Destination airport
Chiang Rai Intl.
Roundtrip price
$1,028
Distance
8362 mi

Washington to Chiang Rai Flights

The cheapest times to fly from Washington to Chiang Rai

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

 

The best time to book a flight from Washington to Chiang Rai

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

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 Chiang Rai in 2025. You can also book with separate airlines for your outbound and return journeys, from $640 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 Chiang Rai 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 Chiang Rai 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 Chiang Rai Intl. Airport (CEI) cost?
Grab a cheap one-way flight from $640 or cheap return flight from $1,029 from Washington Dulles Intl. Airport (IAD) to Chiang Rai Intl. Airport (CEI) 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 Chiang Rai Intl. Airport (CEI)?
Planning your getaway for November is a good way to save, as it's the cheapest month for flights between IAD and CEI. You'll typically find the lowest prices during off-peak months.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Chiang Rai Intl. Airport (CEI)?
To find the cheapest airline that'll fly you from IAD to CEI, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and ideal departure window. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Chiang Rai Intl. Airport (CEI)?
You'll need to take a flight with a layover when traveling from Washington Dulles Intl. Airport (IAD) to Chiang Rai Intl. Airport (CEI). There are no daily direct flights on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from IAD to CEI?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can change based on a range of factors, such as 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 Chiang Rai Intl. Airport (CEI)?
Select a flight from Washington Dulles Intl. Airport (IAD) to Chiang Rai Intl. Airport (CEI) that takes off before 3 PM to reduce the likelihood of delays. Departures after this time have a 22% higher chance of being canceled, on average.**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 Chiang Rai Intl. Airport (CEI) last-minute?
Last-minute bookings from IAD to CEI are usually more expensive. To lock in the best prices, start looking for flights as early as possible. That being said, if you can play around with your travel dates, you may find a cheap ticket just before your departure.
Is it cheaper to book an IAD to CEI flight and hotel package?
Compared with arranging hotels and flights separately, booking an IAD to CEI flight and hotel package with Expedia could result in significant savings. What's more, having everything in one easy place takes the hassle out of planning your trip. Simply pick your flights and select from our wide range of hotels, then customize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Chiang Rai Intl. Airport (CEI)?
In most cases, you can cancel or modify your IAD to CEI flight. However, there may be additional charges, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's rules and fees on flight changes, or if you'd like further details, visit our Customer Service portal.

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*Available to One Key members.