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St. Louis

$308+ Cheap flights from Casper to St. Louis (CPR - STL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/27. Fares are subject to change and may not be available on all flights or dates of travel.
CPR — STL
avr. 12 — avr. 191
dim. 4/12
dim. 4/19
1 adult, Economy
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Cheap flight deals from Casper to St. Louis

Cheapest flights from Casper to St. Louis
Explore the most affordable flight options available from Casper to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on mars 13, 2026.

This United Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 3/271:25 pm
CPR
-
STL
1 stop6h 16m
United Airlines
mar. 3/318:54 am
STL
-
CPR
1 stop4h 52m
United Airlines
Deal found 3/11$308
This United Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 4/1511:22 am
CPR
-
STL
1 stop4h 34m
United Airlines
sam. 4/182:40 pm
STL
-
CPR
1 stop8h 27m
United Airlines
Deal found 3/7$348
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/209:05 am
CPR
-
STL
1 stop6h 51m
United Airlines
sam. 4/258:54 am
STL
-
CPR
1 stop4h 52m
United Airlines
Deal found 3/8$365
This United Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 8/129:25 am
CPR
-
STL
1 stop6h 06m
United Airlines
sam. 8/151:36 pm
STL
-
CPR
1 stop6h 38m
United Airlines
Deal found 3/9$368
This United Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 4/243:14 pm
CPR
-
STL
1 stop4h 40m
United Airlines
mar. 4/284:30 pm
STL
-
CPR
1 stop4h 56m
United Airlines
Deal found 3/7$373

Find flight deals from Casper to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Casper (CPR) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated mars 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$308
(United Airlines)
Provider with most accurate pricing for Casper Natrona County-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Casper Natrona County-Lambert-St Louis flights.
Search Deals
From Casper Natrona County to Lambert-St Louis
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated mars 13, 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

mer. 8/12

7:05 am-4:31 pm

1 stop8h 26m

Lambert-St Louis

sam. 8/15

1:36 pm-7:14 pm

1 stop6h 38m

$348

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

mer. 4/15

11:22 am-4:56 pm

1 stop4h 34m

Lambert-St Louis

sam. 4/18

2:40 pm-10:07 pm

1 stop8h 27m

$348

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

ven. 4/24

5:55 pm-10:31 am

2 stops15h 36m

Lambert-St Louis

mar. 4/28

9:10 am-5:09 pm

2 stops8h 59m

$359
Quickest round-trip

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

lun. 4/20

9:05 am-4:56 pm

1 stop6h 51m

Lambert-St Louis

sam. 4/25

8:54 am-12:46 pm

1 stop4h 52m

$365

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/8

Sorted by cheapest first

Compare providers for flights from Casper to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Casper to St. Louis in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Casper-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Casper-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Casper-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Casper-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Casper-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Casper to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Casper with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated mars 13, 2026.
Get a feel of what it's like to fly with United Airlines from Casper to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,418 reviews

Overall

7.4

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,418 reviews
United Airlines
7.4
Good
9,418 reviews

Overall

7.4

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

Find useful and relevant information for your journey from Casper to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Casper to St. Louis?

    United Airlines can get you from Casper to St. Louis in just under 8h 26m. Your travel time can differ by up to . Airlines will cover a distance of 887 mi.

  • What is the cheapest airline to fly from Casper to St. Louis round-trip?

    United Airlines, at $238, was found to be the cheapest airline from Casper to St. Louis..

  • Can I find deals for flights from Casper to St. Louis that include hotel bookings?

    Yes. In addition to deals on Casper to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Casper to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Casper to St. Louis.

  • Can I find deals for business class flights from Casper to St. Louis?

    Yes. Cheapflights offers flight deals from Casper to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus

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Top airline flying from Casper to St. Louis

Discover the top airline that operate flights from Casper to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated mars 13, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$238Average$398FlexibilityNo cancel feeOn-time69%

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