Cheap United flights from St. Louis to Casper (STL to CPR)

Find The Best Day To Fly from St. Louis to Casper

Amazing United STL to CPR Flight Deals

The cheapest flights to Natrona County Intl. found within the past 7 days were $394 round trip and one way. Prices and availability subject to change. Additional terms may apply.

Sat, Jul 19 - Tue, Jul 22
STL
St. Louis
CPR
Casper
$394 Roundtrip, found 2 days ago
$394
Roundtrip
found 2 days ago
Select United flight, departing Sat, Jul 19 from St. Louis to Casper, returning Tue, Jul 22, priced at $394 found 2 days ago
Sat, Jul 19 - Wed, Jul 23
STL
St. Louis
CPR
Casper
$435 Roundtrip, found 2 days ago
$435
Roundtrip
found 2 days ago
Select United flight, departing Sat, Jul 19 from St. Louis to Casper, returning Wed, Jul 23, priced at $435 found 2 days ago
Wed, Jul 30 - Sun, Aug 3
STL
St. Louis
CPR
Casper
$472 Roundtrip, found 5 days ago
$472
Roundtrip
found 5 days ago
Select United flight, departing Wed, Jul 30 from St. Louis to Casper, returning Sun, Aug 3, priced at $472 found 5 days ago
Wed, Jul 30 - Sun, Aug 3
STL
St. Louis
CPR
Casper
$475 Roundtrip, found 5 days ago
$475
Roundtrip
found 5 days ago
Select United flight, departing Wed, Jul 30 from St. Louis to Casper, returning Sun, Aug 3, priced at $475 found 5 days ago
Sat, Jul 19 - Mon, Jul 21
STL
St. Louis
CPR
Casper
$476 Roundtrip, found 2 days ago
$476
Roundtrip
found 2 days ago
Select United flight, departing Sat, Jul 19 from St. Louis to Casper, returning Mon, Jul 21, priced at $476 found 2 days ago
Wed, Jul 30 - Sun, Aug 3
STL
St. Louis
CPR
Casper
$488 Roundtrip, found 5 days ago
$488
Roundtrip
found 5 days ago
Select United flight, departing Wed, Jul 30 from St. Louis to Casper, returning Sun, Aug 3, priced at $488 found 5 days ago
Wed, Jul 30 - Sun, Aug 3
STL
St. Louis
CPR
Casper
$515 Roundtrip, found 5 days ago
$515
Roundtrip
found 5 days ago
Select United flight, departing Wed, Jul 30 from St. Louis to Casper, returning Sun, Aug 3, priced at $515 found 5 days ago
Sat, Jul 19 - Sun, Jul 20
STL
St. Louis
CPR
Casper
$516 Roundtrip, found 2 days ago
$516
Roundtrip
found 2 days ago
Select United flight, departing Sat, Jul 19 from St. Louis to Casper, returning Sun, Jul 20, priced at $516 found 2 days ago
Wed, Jul 30 - Sun, Aug 3
STL
St. Louis
CPR
Casper
$524 Roundtrip, found 5 days ago
$524
Roundtrip
found 5 days ago
Select United flight, departing Wed, Jul 30 from St. Louis to Casper, returning Sun, Aug 3, priced at $524 found 5 days ago
Wed, Jul 30 - Sun, Aug 3
STL
St. Louis
CPR
Casper
$529 Roundtrip, found 5 days ago
$529
Roundtrip
found 5 days ago
Select United flight, departing Wed, Jul 30 from St. Louis to Casper, returning Sun, Aug 3, priced at $529 found 5 days ago
Wed, Jul 30 - Sun, Aug 3
STL
St. Louis
CPR
Casper
$563 Roundtrip, found 5 days ago
$563
Roundtrip
found 5 days ago
Select United flight, departing Wed, Jul 30 from St. Louis to Casper, returning Sun, Aug 3, priced at $563 found 5 days ago
Wed, Jul 30 - Sun, Aug 3
STL
St. Louis
CPR
Casper
$564 Roundtrip, found 5 days ago
$564
Roundtrip
found 5 days ago
Select United flight, departing Wed, Jul 30 from St. Louis to Casper, returning Sun, Aug 3, priced at $564 found 5 days ago

Frequently asked questions

Can I catch a flight from STL to Natrona County Intl. Airport (CPR) right now?
Be sure to visit our Covid-19 Travel Advisor to learn if there are any current quarantine requirements and travel advice reports in place in Casper Airport when flying from Lambert Field.
What terminal is United Airlines at St. Louis Lambert International Airport?
Your boarding pass should be able to tell you which terminal your United Airlines flight will be leaving from at St. Louis Lambert International Airport. It might also be able to give you the arrival details for Natrona County Intl. Airport (CPR). If not, it's probably a wise idea to consult your airline.
Are there United Airlines non-stop flights from STL to CPR?
As you can't fly direct from Lambert Field to Casper Airport with United Airlines, make the most of your layover. Shout yourself a few refreshments at a nice airport bar, or stroll around the terminal and enjoy some retail therapy.
How long is a United Airlines flight from STL to CPR?
From the instant your United Airlines aircraft is pushed back from the gate at Lambert Field to the instant it taxis into Natrona County Intl. Airport (CPR), you'll be in your seat for roughly 3 hours and 53 minutes. With such a brief flight time, it's a great little spur-of-the-moment getaway.
How many direct and indirect flights does United Airlines fly from STL to CPR?
You'll have loads of flexibility if you choose to fly with United Airlines from STL to CPR. It's currently operating 4 flights per day.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to CPR, please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.
United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16

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2.5 out of 5
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This hotel features an indoor pool, a gym, and a restaurant. Traveling on business? Take advantage of the 24-hour business center and free WiFi in public areas. ...
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Reviewed on Jul 15, 2025

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Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.