HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
St. Louis

$334+ 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 5/30. Fares are subject to change and may not be available on all flights or dates of travel.
CPR — STL
Jun 5 — Jun 121
Fri 6/5
Fri 6/12
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Casper to St. Louis with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 May 6, 2026.

This United Airlines deal was found by Cheapflights users on 5/2. 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.
Sat 5/306:13 pm
CPR
-
STL
1 stop4h 44m
United Airlines
Sat 6/64:45 pm
STL
-
CPR
1 stop6h 20m
United Airlines
Deal found 5/2$334
This United Airlines deal was found by Cheapflights users on 5/4. 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.
Thu 6/186:13 pm
CPR
-
STL
1 stop4h 44m
United Airlines
Mon 6/225:10 am
STL
-
CPR
1 stop4h 41m
United Airlines
Deal found 5/4$371
This United Airlines deal was found by Cheapflights users on 5/4. 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.
Fri 5/229:26 am
CPR
-
STL
2 stops12h 26m
United Airlines
Mon 5/255:10 am
STL
-
CPR
1 stop4h 41m
United Airlines
Deal found 5/4$399
This United Airlines deal was found by Cheapflights users on 5/6. 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.
Wed 7/16:05 pm
CPR
-
STL
1 stop4h 52m
United Airlines
Mon 7/64:48 pm
STL
-
CPR
1 stop6h 11m
United Airlines
Deal found 5/6$406
This United Airlines deal was found by Cheapflights users on 5/4. 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.
Tue 5/195:25 am
CPR
-
STL
2 stops8h 07m
United Airlines
Mon 5/251:38 pm
STL
-
CPR
1 stop7h 55m
United Airlines
Deal found 5/4$489
This United Airlines deal was found by Cheapflights users on 5/2. 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.
Mon 6/16:13 pm
CPR
-
STL
1 stop25h 57m
United Airlines
Sun 6/75:10 am
STL
-
CPR
1 stop4h 41m
United Airlines
Deal found 5/2$513

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 May 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$334
(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 May 6, 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
Quickest round-trip

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Thu 6/18

6:13 pm-11:57 pm

1 stop4h 44m

Lambert-St Louis

Mon 6/22

5:10 am-8:51 am

1 stop4h 41m

$371

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Fri 5/22

9:26 am-10:52 pm

2 stops12h 26m

Lambert-St Louis

Mon 5/25

5:10 am-8:51 am

1 stop4h 41m

$399

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Wed 7/1

6:05 pm-11:57 pm

1 stop4h 52m

Lambert-St Louis

Mon 7/6

4:48 pm-9:59 pm

1 stop6h 11m

$406

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 5/30

6:13 pm-11:57 pm

1 stop4h 44m

Lambert-St Louis

Sat 6/6

6:00 am-10:05 pm

2 stops17h 05m

$429

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Mon 6/1

9:26 am-11:29 pm

2 stops13h 03m

Lambert-St Louis

Sun 6/7

5:10 am-8:51 am

1 stop4h 41m

$429

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Tue 5/19

5:25 am-2:32 pm

2 stops8h 07m

Lambert-St Louis

Mon 5/25

1:38 pm-8:33 pm

1 stop7h 55m

$489

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Mon 5/18

7:10 am-11:57 pm

2 stops15h 47m

Lambert-St Louis

Thu 5/21

1:38 pm-8:33 pm

1 stop7h 55m

$722

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/4

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 May.
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 May 6, 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
9,684 reviews

Overall

7.4

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
United Airlines
7.4
Good
9,684 reviews
United Airlines
7.4
Good
9,684 reviews

Overall

7.4

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.

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 4h 44m. 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 May 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$238Average$398FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.