$564 Cheap Flights from St. Louis (STL) to Chiang Mai (CNX)

View $564 flight on Thu, Jan 22, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Chiang Mai Intl. Airport (CNX)

Cheap Flights from St. Louis to Chiang Mai (STL-CNX)

Prices were available within the past 7 days and start at $564 for one-way flights and $979 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Mon, Oct 27 - Thu, Nov 13
STL
St. Louis
CNX
Chiang Mai
$979 Roundtrip, found 1 hour ago
$979
Roundtrip
found 1 hour ago
Select Delta flight, departing Mon, Oct 27 from St. Louis to Chiang Mai, returning Thu, Nov 13, priced at $979 found 1 hour ago
Delta
Sun, Sep 21 - Sun, Sep 28
STL
St. Louis
CNX
Chiang Mai
$985 Roundtrip, found 4 days ago
$985
Roundtrip
found 4 days ago
Select Delta flight, departing Sun, Sep 21 from St. Louis to Chiang Mai, returning Sun, Sep 28, priced at $985 found 4 days ago
Delta
Mon, Oct 27 - Fri, Nov 14
STL
St. Louis
CNX
Chiang Mai
$1,019 Roundtrip, found 1 hour ago
$1,019
Roundtrip
found 1 hour ago
Select Delta flight, departing Mon, Oct 27 from St. Louis to Chiang Mai, returning Fri, Nov 14, priced at $1,019 found 1 hour ago
Delta
Sun, Sep 21 - Thu, Oct 2
STL
St. Louis
CNX
Chiang Mai
$1,025 Roundtrip, found 1 hour ago
$1,025
Roundtrip
found 1 hour ago
Select Delta flight, departing Sun, Sep 21 from St. Louis to Chiang Mai, returning Thu, Oct 2, priced at $1,025 found 1 hour ago
Delta
Sat, Oct 18 - Thu, Oct 30
STL
St. Louis
CNX
Chiang Mai
$1,025 Roundtrip, found 1 hour ago
$1,025
Roundtrip
found 1 hour ago
Select Delta flight, departing Sat, Oct 18 from St. Louis to Chiang Mai, returning Thu, Oct 30, priced at $1,025 found 1 hour ago
Delta
Fri, Oct 24 - Mon, Nov 10
STL
St. Louis
CNX
Chiang Mai
$1,027 Roundtrip, found 1 hour ago
$1,027
Roundtrip
found 1 hour ago
Select Delta flight, departing Fri, Oct 24 from St. Louis to Chiang Mai, returning Mon, Nov 10, priced at $1,027 found 1 hour ago
Delta
Mon, Sep 22 - Wed, Sep 24
STL
St. Louis
CNX
Chiang Mai
$1,029 Roundtrip, found 4 days ago
$1,029
Roundtrip
found 4 days ago
Select Delta flight, departing Mon, Sep 22 from St. Louis to Chiang Mai, returning Wed, Sep 24, priced at $1,029 found 4 days ago
Alaska Airlines
Thu, Feb 19 - Thu, Feb 26
STL
St. Louis
CNX
Chiang Mai
$1,051 Roundtrip, found 5 days ago
$1,051
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Thu, Feb 19 from St. Louis to Chiang Mai, returning Thu, Feb 26, priced at $1,051 found 5 days ago
Southwest Airlines
Wed, Apr 8 - Wed, Apr 15
STL
St. Louis
CNX
Chiang Mai
$1,096 Roundtrip, found 4 days ago
$1,096
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Wed, Apr 8 from St. Louis to Chiang Mai, returning Wed, Apr 15, priced at $1,096 found 4 days ago
Korean Air
Fri, Sep 19 - Tue, Sep 23
STL
St. Louis
CNX
Chiang Mai
$1,244 Roundtrip, found 4 days ago
$1,244
Roundtrip
found 4 days ago
Select Korean Air flight, departing Fri, Sep 19 from St. Louis to Chiang Mai, returning Tue, Sep 23, priced at $1,244 found 4 days ago

Alternative airports near Chiang Mai

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

Select flight to Chiang Mai Intl. CNX. Cheapest and Closest option available. Average driving time to city center is 10 minutes. Flights from $1,490
CNX
Chiang Mai Intl.
CheapestClosest
Average driving time to city center10 min
Flights from $1,490
Flights from St. Louis (STL) to Chiang Mai (CNX)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Chiang Mai Intl.
Airlines serving
Delta, Korean Air
Roundtrip price
$978
Distance
8416 mi

St. Louis to Chiang Mai Flights

The cheapest times to fly from St. Louis to Chiang Mai

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 St. Louis to Chiang Mai are during the month of October. You can find some of the cheapest flights from St. Louis to Chiang Mai with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Chiang Mai

Sunday is one of the best days to book for cheap flights from St. Louis to Chiang Mai: 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 St. Louis to Chiang Mai

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 St. Louis to Chiang Mai in 2025. You can also book with separate airlines for your outbound and return journeys, from $564 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 St. Louis to Chiang Mai 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 St. Louis to Chiang Mai 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 Lambert-St. Louis Intl. Airport (STL) to Chiang Mai Intl. Airport (CNX) cost?
Secure a cheap one-way flight from $564 or cheap return flight from $979 from Lambert-St. Louis Intl. Airport (STL) to Chiang Mai Intl. Airport (CNX) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Chiang Mai Intl. Airport (CNX)?
The cheapest month to fly from STL to CNX is October, when there's less demand. Off-peak season is typically when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Chiang Mai Intl. Airport (CNX)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find the carrier with the cheapest STL to CNX flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Chiang Mai Intl. Airport (CNX)?
Nonstop flights from Lambert-St. Louis Intl. Airport (STL) to Chiang Mai Intl. Airport (CNX) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to CNX?
Typically you'll have the most choice when it comes to flights on a Friday. Tuesdays are often the quietest.* But this can change depending on the season, 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 Lambert-St. Louis Intl. Airport (STL) to Chiang Mai Intl. Airport (CNX)?
To reach Chiang Mai Intl. Airport (CNX) on schedule, opt for a flight that leaves Lambert-St. Louis Intl. Airport (STL) 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 Lambert-St. Louis Intl. Airport (STL) to Chiang Mai Intl. Airport (CNX) last-minute?
Booking your flight from STL to CNX right before your getaway is usually more expensive. But if you're flexible with your departure times and dates, you could bag a cheap last-minute fare.
Is it cheaper to book a STL to CNX flight and hotel package?
You'll typically save money by booking a STL to CNX flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. After selecting your ideal accommodations and flights, you can add extras such as tours, activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Chiang Mai Intl. Airport (CNX)?
If you reserved your STL to CNX flight within the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the fare type you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal if you'd like more information.

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*Available to One Key members.