$338+ 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 9/26. Fares are subject to change and may not be available on all flights or dates of travel.
CPR — STL
Oct 13 — Oct 201
Round-trip
1 adult, Economy
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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
Best
Last-minute
One-way
Cheapest flights from Casper to St. LouisExplore 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 September 13, 2026.
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 September 13, 2026.
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Sat 9/266:00 pm -
1 stop4h 44m
Wed 9/304:39 pm -
1 stop6h 25m
Deal found 9/11![United Airlines logo]()
$338
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/313:13 pm -
1 stop4h 46m
Tue 11/31:40 pm -
1 stop9h 19m
Deal found 9/10![United Airlines logo]()
$388
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Fri 9/186:00 pm -
1 stop4h 40m
Sat 9/191:36 pm -
1 stop4h 42m
Deal found 9/9![United Airlines logo]()
$398
This United Airlines deal was found by Cheapflights users on 9/13. 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 12/2111:33 am -
1 stop8h 35m
Mon 12/288:48 am -
1 stop9h 33m
Deal found 9/13![United Airlines logo]()
$538
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Tue 12/2211:33 am -
1 stop8h 35m
Tue 12/298:48 am -
1 stop9h 33m
Deal found 9/11![United Airlines logo]()
$547
Best flights from Casper to St. LouisDiscover carefully curated flight deals from Casper to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 13, 2026.
Discover carefully curated flight deals from Casper to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 13, 2026.
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Sat 9/266:00 pm -
1 stop4h 44m
Wed 9/304:39 pm -
1 stop6h 25m
Deal found 9/11![United Airlines logo]()
$338
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Sat 10/313:13 pm -
1 stop4h 46m
Tue 11/31:40 pm -
1 stop9h 19m
Deal found 9/9![United Airlines logo]()
$388
This United Airlines deal was found by Cheapflights users on 9/13. 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 12/2111:33 am -
1 stop8h 35m
Mon 12/288:48 am -
1 stop9h 33m
Deal found 9/13![United Airlines logo]()
$538
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Tue 12/2211:33 am -
1 stop8h 35m
Tue 12/298:48 am -
1 stop9h 33m
Deal found 9/11![United Airlines logo]()
$547
Last-minute flights from Casper to St. LouisDiscover last-minute flight deals from Casper to St. Louis. Data last updated September 13, 2026 and is based on user searches.
Discover last-minute flight deals from Casper to St. Louis. Data last updated September 13, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Fri 9/186:00 pm -
1 stop4h 40m
Sat 9/191:36 pm -
1 stop4h 42m
Deal found 9/9![United Airlines logo]()
$398
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Sat 9/266:00 pm -
1 stop4h 44m
Wed 9/304:39 pm -
1 stop6h 25m
Deal found 9/11![United Airlines logo]()
$338
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/313:13 pm -
1 stop4h 46m
Tue 11/31:40 pm -
1 stop9h 19m
Deal found 9/10![United Airlines logo]()
$388
One-way flights from Casper to St. LouisSearch for one-way flight options from Casper to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 13, 2026.
Search for one-way flight options from Casper to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 13, 2026.
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Mon 9/217:05 am -
1 stop4h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![United Airlines logo]()
$428
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 September 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $338 (United Airlines) |
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 7,457,451 searches. Data last updated September 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
Cheapest round-trip
CasperSt. Louis
CPR Casper Natrona County - STL Lambert-St Louis
CPRSTL
Casper Natrona County
Sat 9/26
6:00 pm-11:44 pm
1 stop4h 44m
Lambert-St Louis
Wed 9/30
4:39 pm-10:04 pm
1 stop6h 25m
$338
CasperSt. Louis
CPR Casper Natrona County - STL Lambert-St Louis
CPRSTL
Casper Natrona County
Sat 10/31
3:13 pm-8:59 pm
1 stop4h 46m
Lambert-St Louis
Tue 11/3
1:40 pm-9:59 pm
1 stop9h 19m
$388
Quickest round-trip
CasperSt. Louis
CPR Casper Natrona County - STL Lambert-St Louis
CPRSTL
Casper Natrona County
Mon 9/21
11:24 am-10:59 pm
2 stops10h 35m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$434
CasperSt. Louis
CPR Casper Natrona County - STL Lambert-St Louis
CPRSTL
Casper Natrona County
Tue 9/22
8:45 am-11:38 pm
2 stops13h 53m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$434
CasperSt. Louis
CPR Casper Natrona County - STL Lambert-St Louis
CPRSTL
Casper Natrona County
Mon 12/21
11:33 am-9:08 pm
1 stop8h 35m
Lambert-St Louis
Mon 12/28
8:48 am-5:21 pm
1 stop9h 33m
$538
CasperSt. Louis
CPR Casper Natrona County - STL Lambert-St Louis
CPRSTL
Casper Natrona County
Tue 12/22
11:33 am-9:08 pm
1 stop8h 35m
Lambert-St Louis
Tue 12/29
8:48 am-5:21 pm
1 stop9h 33m
$547
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
CPR-STL
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 September 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.
Entertainment
7.1
Food
6.7
Comfort
7.3
Overall
7.4
Boarding
7.7
Crew
8.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Entertainment
7.1
Food
6.7
Comfort
7.3
Overall
7.4
Boarding
7.7
Crew
8.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
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.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsFairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Edwardsville
Glencoe
Chesterfield
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Casper and St. Louis flights
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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 7,457,451 searches. Data last updated September 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$298 | Average$378 | FlexibilityNo cancel fee | On-time69% |