WAS - CNX

$535 Find Cheap Flights from Washington, D.C. to Chiang Mai

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Washington, D.C. to Chiang Mai departing on 2/3. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Chiang Mai

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Chiang Mai, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Chiang Mai, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$926
Typical prices: $1,311-$1,421
Etihad Airways
Fri 3/13Sat 3/28
IAD - CNX • 2 stops
Cheapest one-way
$535
Multiple Airlines
Tue 2/3
IAD - CNX • 2 stops
Top airlines
Air China
Cheapest • from $922 (round-trip)
Korean Air
Best reviews • 8.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
January
Cheapest • 23% price drop
January
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Chiang Mai!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Washington, D.C. to Chiang Mai (WAS-CNX)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington, D.C. to Chiang Mai that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Washington, D.C. to Chiang Mai

Fri, Mar 13 - Sat, Mar 28
Etihad Airways Logo
3:35 pm - 11:20 am
IAD
-
CNX
32h 45m2 stops
Etihad Airways Logo
8:50 am - 9:45 am
CNX
-
IAD
35h 55m1 stop
$926Etihad Airways
Fri, Mar 13 - Sun, Mar 22
Etihad Airways Logo
3:35 pm - 11:20 am
IAD
-
CNX
32h 45m2 stops
Etihad Airways Logo
8:50 am - 10:05 am
CNX
-
IAD
36h 15m1 stop
$930Etihad Airways
Wed, Apr 29 - Tue, May 26
Multiple Airlines Logo
12:15 pm - 9:20 am
IAD
-
CNX
34h 05m2 stops
Multiple Airlines Logo
10:10 am - 10:05 am
CNX
-
IAD
34h 55m2 stops
$941Multiple Airlines
Tue, Jan 20 - Tue, Jan 27
Multiple Airlines Logo
11:10 am - 9:25 am
IAD
-
CNX
34h 15m2 stops
Multiple Airlines Logo
10:10 am - 9:10 am
CNX
-
IAD
35h 00m2 stops
$951Multiple Airlines
Wed, May 6 - Wed, May 27
Qatar Airways Logo
8:20 pm - 7:10 pm
IAD
-
CNX
35h 50m2 stops
Qatar Airways Logo
8:00 pm - 4:05 pm
CNX
-
IAD
31h 05m2 stops
$1,037Qatar Airways
Sun, Mar 1 - Wed, Mar 11
Qatar Airways Logo
8:05 pm - 9:25 am
IAD
-
CNX
49h 20m2 stops
Qatar Airways Logo
12:10 pm - 4:55 pm
CNX
-
IAD
39h 45m2 stops
$1,058Qatar Airways
Sun, Feb 15 - Sun, Mar 22
Delta Logo
5:25 pm - 10:55 pm
IAD
-
CNX
41h 30m2 stops
Delta Logo
12:15 am - 11:49 pm
CNX
-
IAD
34h 34m2 stops
$1,083Delta
Fri, Feb 6 - Fri, Feb 20
Korean Air Logo
6:00 am - 10:55 pm
DCA
-
CNX
28h 55m2 stops
Korean Air Logo
12:15 am - 4:27 pm
CNX
-
DCA
28h 12m2 stops
$1,218Korean Air
Tue, Jan 20 - Mon, Jan 26
Delta Logo
7:55 pm - 10:55 pm
BWI
-
CNX
39h 00m2 stops
Delta Logo
12:15 am - 10:02 pm
CNX
-
BWI
33h 47m2 stops
$1,233Delta
Mon, Mar 9 - Wed, Mar 11
Korean Air Logo
10:10 am - 10:55 pm
DCA
-
CNX
25h 45m2 stops
Korean Air Logo
12:15 am - 5:00 pm
CNX
-
DCA
27h 45m2 stops
$1,263Korean Air
Booking Insights

KAYAK's insights & trends for Washington, D.C. to Chiang Mai flights

Get data-powered insights and trends into flights from Washington, D.C. to Chiang Mai to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Washington, D.C. to Chiang Mai?

The average price of all round-trip flights from Washington, D.C. to Chiang Mai clicked on KAYAK for each day over the last 12 months.

For Washington, D.C. to Chiang Mai, Monday is the cheapest day to fly on average and Saturday is the most expensive. Flying from Chiang Mai back to Washington, D.C., the best deals are generally found on Monday, with Tuesday being the most expensive.

What is the cheapest month to fly from Washington, D.C. to Chiang Mai?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. to Chiang Mai, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Washington, D.C. to Chiang Mai is January, where tickets cost $1,128 (return) on average. On the other hand, the most expensive months are April and August, where the average cost of round-trip tickets is $2,486 and $1,666 respectively.

Good to know

Low seasonApril
Cheapest flight$535
Best time to beat the crowds but there is an average 70% increase in price.
Most popular time to fly and prices are also 23% lower on average.
Flight from Washington Dulles Airport to Chiang Mai

When to book flights from Washington, D.C. to Chiang Mai

Are your dates flexible? Find out the best times to travel from Washington, D.C. to Chiang Mai based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Washington, D.C. to Chiang Mai

  • What is the cheapest flight from Washington, D.C. to Chiang Mai?

    In the last 3 days, the lowest price for a flight from Washington, D.C. to Chiang Mai was $535 for a one-way ticket and $922 for a round-trip.

  • Do I need a passport to fly between Washington, D.C. and Chiang Mai?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Washington, D.C. and on arrival in Chiang Mai.

  • Which airports will I be using when flying from Washington, D.C. to Chiang Mai?

    There are 2 airports in Washington, D.C. (Washington, D.C. Reagan-National and Washington, D.C. Dulles Intl.) and only 1 airport in Chiang Mai (Chiang Mai). The cheapest flights are generally found on the Reagan Washington National Airport to Chiang Mai flight route.

  • Which aircraft models fly most regularly from Washington, D.C. to Chiang Mai?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Washington, D.C. to Chiang Mai?

    SkyTeam is the only airline alliance operating flights between Washington, D.C. and Chiang Mai.

  • What is the most popular layover when flying to Chiang Mai from Washington, D.C.?

    Incheon is the most popular layover city among KAYAK users traveling from Washington, D.C. to Chiang Mai.

  • Which is the best airline for flights from Washington, D.C. to Chiang Mai, Korean Air or Delta?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Chiang Mai are Korean Air and Delta. With an average price for the route of $1,230 and an overall rating of 8.4, Korean Air is the most popular choice. Delta is also a great choice for the route, with an average price of $1,128 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Washington, D.C. to Chiang Mai?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington, D.C. to Chiang Mai.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington, D.C. to Chiang Mai?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Chiang Mai from Washington, D.C. is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Washington, D.C. to Chiang Mai?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Chiang Mai with an airline and back to Washington, D.C. with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington, D.C. to Chiang Mai?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Chiang Mai from Washington, D.C. up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Washington, D.C. to Chiang Mai

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Chiang Mai. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Washington, D.C. to Chiang Mai? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.4
Korean AirOverall score based on 1183 reviews
8.2Entertainment
8.3Comfort
8.5Boarding
8.1Food
8.7Crew
Airline reviews

The boarding process was efficient and quick. The seats were comfortable. The food was good. The service was excellent. We had a lovely flight from Seattle on Korean air

10.0 ExcellentVivian, Nov 2025
SEA - ICN
Read more Korean Air reviews

The boarding process was efficient and quick. The seats were comfortable. The food was good. The service was excellent. We had a lovely flight from Seattle on Korean air

Flight crew was fantastic. The aircraft was meticulously cleaned at all times. The crew was continuously checking to see if the passengers were ok.

They were trying to get people to check luggage because the over head compartments were full but when we boarded there were lots of empty places that people could have put the luggage.

It was good, I liked the self-serve snacks but it was a little difficult to get the alcohol, which is understandable since I wouldn't want kids sneaking it.

Friendly flight attendants and gate agents. Very clean plane and food was good!

I was unable to select decent seats, and so I was stuck in the middle seat because it was selected for me

There was a lot of partial tv shows but not enough to last the flight. The food was incredible! The crew were so helpful and patient. Lots more space than what I usually get on an international flight. Very comfortable!

Stingy on the drinks - 15 hour direct flight and could barely get attention for some water

Not many people, so you can lay down on two seats

They did an excellent job helping me with a wheelchair. I couldn’t have asked for any better help.

The food is terrible. The staff is wonderful. Comfort is good.

Left on time, a bit delayed due to headwinds most of the trip.

I fly Delta all the time, have Platinum Medallion status. But this route seems to have major problems with delays and seems to never leave on time! Have only taken it twice in the last two weeks, and each time it had delays of more than 1 hour... very disappointed!!!!

Getting to the flight was arduous and lengthy. The flight itself was good but the food option wasn’t a good selection. I need to do a Kosher option on my return. Flight crew were nice

Good seats in Main cabin, excellent service and excellent landing

My flight was cancelled with no explanation after I had already cleared security. I was given 4 options to rebook, only one being non-stop like I had paid for. I grabbed it. It was 4 plus hours later and then took off even later. Biggest complaint is that I booked early and had an aisle seat. They gave me a "window" seat in front of the exit row, so the seat did not decline. I weigh all of 103 #s and it was tight for me! For what I paid, I feel I was kind of ripped off. I think they should have given me the empty comfort seat for the inconvenience. There was no apology nor any explanation as to why the flight was cancelled. My guess is it benefitted Delta in some way.

Very smooth, on-time, and pleasantly uneventful flight. The team at the gate and on board were professional and genuinely courteous. The pilot kept us well updated throughout, and both takeoff and landing were steady and enjoyable without any drama. Just a good, solid flight. Thank you! 💗

Staff was exceptional! Everyone was kind, professional and friendly making the trip very pleasant. Thank you!

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

We had a lot of really rough weather but that was not Delta's fault. Pilot was amazing.

Everything you need to know for your flight from Washington, D.C. to Chiang Mai

Information on your arrival and departure airports