Title: Cheap Flights from St. Louis (STL) to Chiang Mai (CNX) - Expedia.ca ![White Temple Chiang Rai Thailand, Wat Rong Khun, aka The White Temple, in Chiang Rai, Thailand.](https://images.trvl-media.com/place/6056197/dfad0961-9632-4e84-940a-d60dca1f9638.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/6056197/dfad0961-9632-4e84-940a-d60dca1f9638.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # Cheap Flights from St. Louis (STL) to Chiang Mai (CNX) - [Roundtrip](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ## Popular airlines from Lambert-St. Louis International Airport (STL) to Chiang Mai Intl. Airport (CNX) - ![Korean Air](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_KE.svg) Korean Air [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:cnx,departure:29/10/2025TANYT&leg2=from:cnx,to:stl,departure:05/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"KE"}}]) - ![Delta](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:cnx,departure:29/10/2025TANYT&leg2=from:cnx,to:stl,departure:05/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) ![notification illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* ![deals illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 30% on select hotels after you book a flight\* ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.ca/login) Flight from St. Louis to Chiang Mai (STL - CNX) route information | Origin airport | Lambert-St. Louis Intl. | | --- | --- | | Destination airport | Chiang Mai Intl. | | Distance | 13467 km | ## St. Louis to Chiang Mai Flights **The easy way to book your flights from St. Louis to Chiang Mai**  With Expedia, it’s simple to find and book flights to Chiang Mai from St. Louis whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from airlines that cover this route. There are nonstop flights to Chiang Mai Intl., too.   Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from St. Louis to Chiang Mai today, tomorrow, or this week.   **Save dollars with cheap flights from Lambert-St. Louis Intl., STL to Chiang Mai Intl., CNX**  Sort your search results by price to find great deals on your flight from St. Louis to Chiang Mai—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Chiang Mai from St. Louis currently is just rising to .   Here are more money-saving tips:  - Fly in when flight prices are normally at their lowest  - Book about a month to 6 weeks before you travel for the best prices to Chiang Mai   - Avoid peak season and weekends when flights can cost more - Early morning and late-night flights are sometimes cheaper, so try varying your travel times  - One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free!  **Reasons to choose Expedia for your flight to Chiang Mai from St. Louis**  Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Chiang Mai with Expedia today. ## Frequently asked questions ### How much is a flight from Lambert-St. Louis Intl. Airport (STL) to Chiang Mai Airport? > If you're planning on travelling between STL and Chiang Mai Airport, round-trip flights start from . This price is based on airfares advertised within the last 7 days on Expedia for flights departing within the next year, so don't wait around. Book now and save yourself money and time. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from Lambert-St. Louis Intl. Airport (STL) to CNX? > This varies between air carriers, as each one has its own set of terms and conditions. Visit the [Customer Service Portal](https://www.expedia.ca/helpcenter), where there are easy-to-follow instructions on how to cancel your flight online. ### How do I find cheap flights from Lambert Field to CNX that have flexible change policies? > Use our "No change fees" filter to find flexible ticketing options for your flight from Lambert-St. Louis Intl. Airport (STL) to Chiang Mai Airport. This allows you to snag a fantastic price ahead of time and still have the freedom to reschedule without any extra fees. If the new flight costs more, you'll just cover the difference. ### How far is the flight from Lambert Field to CNX? > The distance is around 13,600 kilometres. Travel pillow? Check. Toiletries? Double check. We suggest you pack all the travel comforts for this long-haul St. Louis to Chiang Mai flight. ### Which airlines fly direct from STL to CNX? > Flying directly between STL and Chiang Mai Intl. Airport (CNX) isn't possible right now. However, you'll still be able to find a flight to Chiang Mai with at least one stop. ### Are Lambert-St. Louis Intl. Airport (STL) to Chiang Mai Intl. Airport (CNX) flight tickets cheaper when they're purchased at the last minute? > Last-minute bookings from Lambert Field to CNX can be hit-or-miss. You may be able to find a bargain, but you could also completely miss out! If you'd rather play it safe and start planning early, Expedia compares flight deals up to a year in advance. Just remember that not all airlines publish their prices that far in advance. Our top tip? 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