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Cheap flights from Casper to St. Louis from $293

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Casper to St. Louis departing on 8/9. 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

Discover deals from 900+ travel sites with momondo.

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
8:45 am - 4:34 pm
CPR
-
STL
6h 49m
1 stop
United Airlines Logo
4:49 pm - 10:04 pm
STL
-
CPR
6h 15m
1 stop
$298United Airlines
Wed, Sep 23 - Sat, Sep 26
United Airlines Logo
1:26 pm - 10:59 pm
CPR
-
STL
8h 33m
2 stops
United Airlines Logo
4:49 pm - 8:17 pm
STL
-
CPR
4h 28m
1 stop
$304United Airlines
Wed, Sep 23 - Sat, Sep 26
United Airlines Logo
1:26 pm - 8:46 pm
CPR
-
STL
6h 20m
1 stop
United Airlines Logo
1:36 pm - 9:59 pm
STL
-
CPR
9h 23m
1 stop
$378United Airlines
Sat, Aug 22 - Tue, Aug 25
United Airlines Logo
7:05 am - 4:34 pm
CPR
-
STL
8h 29m
1 stop
United Airlines Logo
10:53 am - 8:27 pm
STL
-
CPR
10h 34m
2 stops
$384United Airlines
Sat, Aug 22 - Tue, Aug 25
United Airlines Logo
10:01 am - 10:00 pm
CPR
-
STL
10h 59m
2 stops
United Airlines Logo
8:50 am - 7:09 pm
STL
-
CPR
11h 19m
2 stops
$389United Airlines
Sat, Aug 22 - Tue, Aug 25
United Airlines Logo
5:15 am - 5:27 pm
CPR
-
STL
11h 12m
2 stops
United Airlines Logo
5:10 am - 10:46 am
STL
-
CPR
6h 36m
1 stop
$429United Airlines
Wed, Aug 5 - Sun, Aug 9
United Airlines Logo
11:24 am - 10:59 pm
CPR
-
STL
10h 35m
2 stops
United Airlines Logo
9:04 am - 5:03 pm
STL
-
CPR
8h 59m
2 stops
$484United Airlines
Wed, Sep 23 - Sat, Sep 26
United Airlines Logo
5:15 am - 5:27 pm
CPR
-
STL
11h 12m
2 stops
United Airlines Logo
5:10 am - 8:51 am
STL
-
CPR
4h 41m
1 stop
$498United Airlines
Thu, Aug 6 - Sun, Aug 9
United Airlines Logo
6:05 pm - 11:57 pm
CPR
-
STL
4h 52m
1 stop
United Airlines Logo
5:10 am - 10:46 am
STL
-
CPR
6h 36m
1 stop
$758United Airlines
Wed, Aug 5 - Sun, Aug 9
United Airlines Logo
7:05 am - 12:42 pm
CPR
-
STL
4h 37m
1 stop
United Airlines Logo
4:48 pm - 8:33 pm
STL
-
CPR
4h 45m
1 stop
$861United Airlines
Sun, Aug 9 - Sun, Aug 9

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United Airlines flights from Casper to St. Louis

Our best United Airlines deals on Casper to St. Louis flight tickets
United Airlines
Aug 6
CPR6:13 pmCasper Natrona County
4h 44m
1 stop
STL11:57 pmLambert-St Louis
Aug 9
STL5:10 amLambert-St Louis
6h 36m
1 stop
CPR10:46 amCasper Natrona County
$298
United Airlines
Aug 22
CPR1:26 pmCasper Natrona County
6h 20m
1 stop
STL8:46 pmLambert-St Louis
Aug 25
STL1:36 pmLambert-St Louis
9h 23m
1 stop
CPR9:59 pmCasper Natrona County
$378
United Airlines
Aug 22
CPR7:05 amCasper Natrona County
8h 29m
1 stop
STL4:34 pmLambert-St Louis
Aug 25
STL10:53 amLambert-St Louis
10h 34m
2 stops
CPR8:27 pmCasper Natrona County
$384

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 July 12, 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

Cheapest round-trip

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Wed 9/23

8:45 am-4:34 pm

1 stop6h 49m

Lambert-St Louis

Sat 9/26

4:49 pm-10:04 pm

1 stop6h 15m

$298

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Wed 9/23

1:26 pm-10:59 pm

2 stops8h 33m

Lambert-St Louis

Sat 9/26

4:49 pm-8:17 pm

1 stop4h 28m

$304

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 8/22

1:26 pm-8:46 pm

1 stop6h 20m

Lambert-St Louis

Tue 8/25

1:36 pm-9:59 pm

1 stop9h 23m

$378

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 8/22

7:05 am-4:34 pm

1 stop8h 29m

Lambert-St Louis

Tue 8/25

10:53 am-8:27 pm

2 stops10h 34m

$384

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 8/22

10:01 am-10:00 pm

2 stops10h 59m

Lambert-St Louis

Tue 8/25

8:50 am-7:09 pm

2 stops11h 19m

$389

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Wed 8/5

5:15 am-5:27 pm

2 stops11h 12m

Lambert-St Louis

Sun 8/9

5:10 am-10:46 am

1 stop6h 36m

$429

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Wed 9/23

11:24 am-10:59 pm

2 stops10h 35m

Lambert-St Louis

Sat 9/26

9:04 am-5:03 pm

2 stops8h 59m

$484

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Thu 8/6

5:15 am-5:27 pm

2 stops11h 12m

Lambert-St Louis

Sun 8/9

5:10 am-8:51 am

1 stop4h 41m

$498

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Wed 8/5

6:05 pm-11:57 pm

1 stop4h 52m

Lambert-St Louis

Sun 8/9

5:10 am-10:46 am

1 stop6h 36m

$758
Quickest round-trip

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sun 8/9

7:05 am-12:42 pm

1 stop4h 37m

Lambert-St Louis

Sun 8/9

4:48 pm-8:33 pm

1 stop4h 45m

$861

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

See travel insights to St. Louis from

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

4h 44m

Direct flights

None
The fastest flight from Casper to St. Louis takes 4h 44m
There are no direct flights from Casper to St. Louis. There are no popular flight routes from Casper to St. Louis.
Search flight deals

Frequently asked questions about flying from Casper to St. Louis

  • 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. 4h 44m 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 $308Free CancellationRating
7.4
9,979 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
Fairview Heights
Hermann
Collinsville
Florissant
St. Peters
Maryland Heights
O'Fallon
Alton
Farmington
Wentzville
Clayton
Fenton
Festus
Eureka
Edwardsville
Litchfield
Grafton
Shrewsbury

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Casper to St. Louis. Millions of users trust and use momondo every year so you are in good hands.

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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