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Cheap flights from St. Louis to Chiang Mai from $1,245

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Chiang Mai departing on 1/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from St. Louis to Chiang Mai

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
5:50 am - 10:25 am
STL
-
CNX
39h 35m
2 stops
Multiple Airlines Logo
11:25 am - 2:26 pm
CNX
-
STL
40h 01m
2 stops
$1,245Multiple Airlines
Fri, Jan 15 - Sun, Feb 21
Multiple Airlines Logo
3:24 pm - 10:35 am
STL
-
CNX
30h 11m
2 stops
Multiple Airlines Logo
11:50 am - 2:26 pm
CNX
-
STL
39h 36m
2 stops
$1,254Multiple Airlines
Tue, Jan 12 - Thu, Jan 28
Multiple Airlines Logo
4:32 pm - 10:25 am
STL
-
CNX
28h 53m
2 stops
Multiple Airlines Logo
11:25 am - 2:26 pm
CNX
-
STL
40h 01m
2 stops
$1,254Multiple Airlines
Mon, Jan 4 - Thu, Jan 21
Multiple Airlines Logo
4:32 pm - 10:25 am
STL
-
CNX
28h 53m
2 stops
Multiple Airlines Logo
11:25 am - 2:26 pm
CNX
-
STL
40h 01m
2 stops
$1,255Multiple Airlines
Mon, Jan 4 - Thu, Jan 21
Multiple Airlines Logo
3:04 pm - 10:25 am
STL
-
CNX
31h 21m
2 stops
Multiple Airlines Logo
11:35 am - 2:04 pm
CNX
-
STL
38h 29m
2 stops
$1,276Multiple Airlines
Mon, Aug 24 - Mon, Aug 31
Qatar Airways Logo
9:33 am - 11:20 am
STL
-
CNX
36h 47m
3 stops
Qatar Airways Logo
7:45 pm - 9:08 pm
CNX
-
STL
38h 23m
3 stops
$1,593Qatar Airways
Tue, Jan 12 - Thu, Jan 28
Qatar Airways Logo
9:33 am - 9:25 am
STL
-
CNX
34h 52m
3 stops
Qatar Airways Logo
7:45 pm - 11:44 pm
CNX
-
STL
40h 59m
3 stops
$1,622Qatar Airways
Thu, Jan 14 - Sun, Feb 14
Qatar Airways Logo
9:33 am - 11:20 am
STL
-
CNX
36h 47m
3 stops
Qatar Airways Logo
7:45 pm - 9:08 pm
CNX
-
STL
38h 23m
3 stops
$1,670Qatar Airways
Tue, Jan 12 - Thu, Jan 28
Qatar Airways Logo
1:25 pm - 11:15 am
STL
-
CNX
33h 50m
3 stops
Qatar Airways Logo
8:00 pm - 11:42 pm
CNX
-
STL
39h 42m
3 stops
$1,684Qatar Airways
Mon, Aug 24 - Mon, Aug 31
Qatar Airways Logo
1:06 pm - 1:50 pm
STL
-
CNX
35h 44m
3 stops
Qatar Airways Logo
7:45 pm - 9:08 pm
CNX
-
STL
38h 23m
3 stops
$1,691Qatar Airways
Tue, Jan 12 - Thu, Jan 28

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Qatar Airways flights from St. Louis to Chiang Mai

Our best Qatar Airways deals on St. Louis to Chiang Mai flight tickets
Qatar Airways
Jan 12
STL9:33 amLambert-St Louis
36h 47m
3 stops
CNX11:20 amChiang Mai
Jan 28
CNX7:45 pmChiang Mai
38h 23m
3 stops
STL9:08 pmLambert-St Louis
$1,593
Qatar Airways
Jan 14
STL9:33 amLambert-St Louis
36h 47m
3 stops
CNX11:20 amChiang Mai
Feb 14
CNX7:45 pmChiang Mai
40h 59m
3 stops
STL11:44 pmLambert-St Louis
$1,622
Qatar Airways
Jan 12
STL9:33 amLambert-St Louis
36h 47m
3 stops
CNX11:20 amChiang Mai
Jan 28
CNX7:45 pmChiang Mai
38h 23m
3 stops
STL9:08 pmLambert-St Louis
$1,670

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Chiang Mai that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated July 29, 2026.
Use the filters below to find and compare flights from St. Louis to Chiang Mai that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisChiang Mai

STL - CNX

STLCNX

Lambert-St Louis

Fri 1/15

5:50 am-10:25 am

2 stops39h 35m

Chiang Mai

Sun 2/21

11:25 am-2:26 pm

2 stops40h 01m

$1,245

St. LouisChiang Mai

STL - CNX

STLCNX

Lambert-St Louis

Tue 1/12

3:24 pm-10:35 am

2 stops30h 11m

Chiang Mai

Thu 1/28

11:50 am-2:26 pm

2 stops39h 36m

$1,254
Quickest round-trip

St. LouisChiang Mai

STL - CNX

STLCNX

Lambert-St Louis

Mon 1/4

4:32 pm-10:25 am

2 stops28h 53m

Chiang Mai

Thu 1/21

11:25 am-2:26 pm

2 stops40h 01m

$1,254

St. LouisChiang Mai

STL - CNX

STLCNX

Lambert-St Louis

Mon 1/4

4:32 pm-10:25 am

2 stops28h 53m

Chiang Mai

Thu 1/21

11:25 am-2:26 pm

2 stops40h 01m

$1,255

St. LouisChiang Mai

STL - CNX

STLCNX

Lambert-St Louis

Mon 8/24

3:04 pm-10:25 am

2 stops31h 21m

Chiang Mai

Mon 8/31

11:35 am-2:04 pm

2 stops38h 29m

$1,276

St. LouisChiang Mai

STL - CNX

STLCNX

Lambert-St Louis

Tue 1/12

9:33 am-11:20 am

3 stops36h 47m

Chiang Mai

Thu 1/28

7:45 pm-9:08 pm

3 stops38h 23m

$1,593

St. LouisChiang Mai

STL - CNX

STLCNX

Lambert-St Louis

Thu 1/14

9:33 am-9:25 am

3 stops34h 52m

Chiang Mai

Sun 2/14

7:45 pm-11:44 pm

3 stops40h 59m

$1,622

St. LouisChiang Mai

STL - CNX

STLCNX

Lambert-St Louis

Tue 1/12

9:33 am-11:20 am

3 stops36h 47m

Chiang Mai

Thu 1/28

7:45 pm-9:08 pm

3 stops38h 23m

$1,670

St. LouisChiang Mai

STL - CNX

STLCNX

Lambert-St Louis

Mon 8/24

1:25 pm-11:15 am

3 stops33h 50m

Chiang Mai

Mon 8/31

8:00 pm-11:42 pm

3 stops39h 42m

$1,684

St. LouisChiang Mai

STL - CNX

STLCNX

Lambert-St Louis

Tue 1/12

1:06 pm-1:50 pm

3 stops35h 44m

Chiang Mai

Thu 1/28

7:45 pm-9:08 pm

3 stops38h 23m

$1,691

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from St. Louis to Chiang Mai

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Chiang Mai according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Chiang Mai (STL to CNX) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Chiang Mai

Fastest flight time

25h 15m

Direct flights

None
The fastest flight from St. Louis to Chiang Mai takes 25h 15m
There are no direct flights from St. Louis to Chiang Mai. There are no popular flight routes from St. Louis to Chiang Mai.
Search flight deals

Frequently asked questions about flying from St. Louis to Chiang Mai

  • How far is Lambert-St Louis to Chiang Mai by plane?

    The distance between Lambert-St Louis and Chiang Mai is about 8419.6 mi. By plane, this route typically takes 25h 15m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Chiang Mai Airport?

    Prices for flights from Lambert-St Louis Airport to Chiang Mai Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Lambert-St Louis Airport to Chiang Mai Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Chiang Mai Airport.

  • What documentation or ID do you need to fly to Chiang Mai Airport?

    The travel and health documents required for your trip to Chiang Mai Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Chiang Mai Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Frequently asked questions about flying from St. Louis to Chiang Mai

  • How do I get Price Alerts for flights from St. Louis to Chiang Mai?

    Confirm your travel details to search for the latest offers for flights from St. Louis to Chiang Mai. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from St. Louis to Chiang Mai with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Chiang Mai?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Chiang Mai. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Chiang Mai with flexible booking policies on momondo?

All flight searches from St. Louis to Chiang Mai on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Chiang Mai?

Once you have performed a search for St. Louis to Chiang Mai flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from St. Louis to Chiang Mai right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of St. Louis to Chiang Mai flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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