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Cheap flights from Casper to St. Louis from $368

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Casper to St. Louis departing on 2/14. 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
0 bags

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Find the cheapest flights from Casper to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
7:10 am - 1:14 pm
CPR
-
STL
5h 04m
1 stop
United Airlines Logo
6:00 pm - 10:09 pm
STL
-
CPR
5h 09m
1 stop
$368United Airlines
Sat, Feb 14 - Wed, Feb 18
United Airlines Logo
11:26 am - 9:05 pm
CPR
-
STL
8h 39m
2 stops
United Airlines Logo
6:00 pm - 10:09 pm
STL
-
CPR
5h 09m
1 stop
$374United Airlines
Sat, Feb 14 - Wed, Feb 18
United Airlines Logo
7:10 am - 4:02 pm
CPR
-
STL
7h 52m
2 stops
United Airlines Logo
8:17 am - 7:02 pm
STL
-
CPR
11h 45m
2 stops
$379United Airlines
Sat, Feb 14 - Wed, Feb 18

United Airlines flights from Casper to St. Louis

Our best United Airlines deals on Casper to St. Louis flight tickets
United Airlines
Feb 14
CPR7:10 amCasper Natrona County
5h 04m
1 stop
STL1:14 pmLambert-St Louis
Feb 18
STL6:00 pmLambert-St Louis
5h 09m
1 stop
CPR10:09 pmCasper Natrona County
$368
United Airlines
Feb 14
CPR11:26 amCasper Natrona County
8h 39m
2 stops
STL9:05 pmLambert-St Louis
Feb 18
STL6:00 pmLambert-St Louis
5h 09m
1 stop
CPR10:09 pmCasper Natrona County
$374
United Airlines
Feb 14
CPR5:25 amCasper Natrona County
9h 37m
2 stops
STL4:02 pmLambert-St Louis
Feb 18
STL8:30 amLambert-St Louis
11h 32m
2 stops
CPR7:02 pmCasper Natrona County
$379

momondo Fare Finder

 
Customize your flight search to find flights from Casper to St. Louis 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 February 3, 2026.
Use the filters below to find and compare flights from Casper to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 2/14

7:10 am-1:14 pm

1 stop5h 04m

Lambert-St Louis

Wed 2/18

6:00 pm-10:09 pm

1 stop5h 09m

$368

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 2/14

11:26 am-9:05 pm

2 stops8h 39m

Lambert-St Louis

Wed 2/18

6:00 pm-10:09 pm

1 stop5h 09m

$374

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 2/14

7:10 am-4:02 pm

2 stops7h 52m

Lambert-St Louis

Wed 2/18

8:17 am-7:02 pm

2 stops11h 45m

$379

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Tue 6/23

9:26 am-11:58 pm

1 stop13h 32m

$427

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Tue 6/23

7:00 am-9:11 pm

2 stops13h 11m

$432

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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How to get the cheapest flight ticket from Casper to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Casper Natrona County to Lambert-St Louis?

United Airlines is the most popular carrier operating from Casper Natrona County to Lambert-St Louis

When to book flights from Casper to St. Louis

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

Cheap Casper to St. Louis (CPR to STL) flight deals and tips

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

Fastest flight time

5h 04m

Direct flights

None
The fastest flight from Casper to St. Louis takes 5h 04m
There are no direct flights from Casper to St. Louis. There are no popular flight routes from Casper to St. Louis.
Search flight deals

  • How far is Casper Natrona County to Lambert-St Louis by plane?

    There are 891.0 mi between Casper Natrona County and Lambert-St Louis. 5h 04m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Casper Natrona County Airport to Lambert-St Louis Airport?

    Prices for flights from Casper Natrona County Airport to Lambert-St Louis Airport are updated daily.

  • How many operators does momondo search for flights from Casper Natrona County Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Casper Natrona County Airport to Lambert-St Louis 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 Casper Natrona County Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Casper to St. Louis?

Best airlines flying from Casper to St. Louis

Compare and see reviews for airlines that fly from Casper to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $301Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Collinsville
St. Peters
Fenton
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Litchfield
Glencoe
Shrewsbury

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

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

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Casper to St. Louis.

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

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Casper and alert you when they change.

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