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$238+ Cheap flights from St. Louis to Casper (STL - CPR)

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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — CPR
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheap flight deals from St. Louis to Casper

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Casper (CPR). 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 August 18, 2025.

Round-trip from

$238
(United Airlines)

Popular in

March

Cheapest in

June

Average price

$351
From Lambert-St Louis to Casper Natrona County
Search Deals
Highest demand for flights based on searches. 32% potential increase in price ($224 potential increase over avg. RT price).
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Cheapest flight prices on average. 14% potential price decrease ($58 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from St. Louis to Casper

Cheapest flights from St. Louis to Casper
Explore the most affordable flight options available from St. Louis to Casper. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This United Airlines deal was found by Cheapflights users on 8/18. 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 9/134:50 pmSTL - CPR
1 stop6h 24mUnited Airlines
Tue 9/161:37 pmCPR - STL
1 stop6h 09mUnited Airlines
Deal found 8/18$238
This United Airlines deal was found by Cheapflights users on 8/18. 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 9/25:15 amSTL - CPR
1 stop6h 35mUnited Airlines
Sat 9/63:11 pmCPR - STL
1 stop4h 35mUnited Airlines
Deal found 8/18$248
This United Airlines deal was found by Cheapflights users on 8/17. 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 9/2612:25 pmSTL - CPR
2 stops8h 52mUnited Airlines
Mon 9/296:00 pmCPR - STL
1 stop4h 58mUnited Airlines
Deal found 8/17$315
This United Airlines deal was found by Cheapflights users on 8/16. 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 12/111:35 pmSTL - CPR
1 stop6h 52mUnited Airlines
Thu 1/11:22 pmCPR - STL
1 stop8h 00mUnited Airlines
Deal found 8/16$419
This United Airlines deal was found by Cheapflights users on 8/17. 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 10/95:15 amSTL - CPR
1 stop8h 26mUnited Airlines
Mon 10/131:32 pmCPR - STL
1 stop9h 26mUnited Airlines
Deal found 8/17$449
This United Airlines deal was found by Cheapflights users on 8/17. 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 9/2612:25 pmSTL - CPR
2 stops8h 52mUnited Airlines
Sun 9/2811:22 amCPR - STL
1 stop8h 24mUnited Airlines
Deal found 8/17$464

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Casper 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 August 18, 2025.
Use the filters below to find and compare flights from St. Louis to Casper that are best for you.

Fly from

St. Louis

Fly to

Casper

Route

Depart

Return

Price

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Sat 9/13

4:50 pm-10:14 pm

1 stop6h 24m

Casper Natrona County

Tue 9/16

1:37 pm-8:46 pm

1 stop6h 09m

$238

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Tue 9/2

5:15 am-10:50 am

1 stop6h 35m

Casper Natrona County

Sat 9/6

3:11 pm-8:46 pm

1 stop4h 35m

$248

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Fri 9/26

12:25 pm-8:17 pm

2 stops8h 52m

Casper Natrona County

Mon 9/29

6:00 pm-11:58 pm

1 stop4h 58m

$315

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Thu 12/11

1:35 pm-7:27 pm

1 stop6h 52m

Casper Natrona County

Thu 1/1

1:22 pm-10:22 pm

1 stop8h 00m

$419

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Thu 10/9

5:15 am-12:41 pm

1 stop8h 26m

Casper Natrona County

Mon 10/13

1:32 pm-11:58 pm

1 stop9h 26m

$449

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Fri 9/26

12:25 pm-8:17 pm

2 stops8h 52m

Casper Natrona County

Sun 9/28

11:22 am-8:46 pm

1 stop8h 24m

$464

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

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

Have a flexible travel schedule? Discover the best time to fly to Casper from St. Louis 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 Casper

Get insights into the airlines that provide service to Casper. 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 Casper. Reviews last updated August 18, 2025.
See what other customers who have flown with United Airlines from St. Louis to Casper have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,925 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
United Airlines
7.4
Good
8,925 reviews
United Airlines
7.4
Good
8,925 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Casper. 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 St. Louis to Casper?

    For as low as $238, United Airlines can have you in Casper from St. Louis in 6h 24m. The distance from St. Louis to Casper is about 887 mi.

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

    Cheapflights users have booked flights from St. Louis to Casper round-trip from $238. United Airlines is currently priced 48% below the average price you’ll pay for this route.

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

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

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

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

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

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

  • What is the cheapest month to book a flight from St. Louis to Casper?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Casper (average of $348). Flying from St. Louis to Casper in June is currently the most expensive (average of $504). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Casper?

Book flights to Casper if you plan to visit one of these locations
Rawlins

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Top airline flying from St. Louis to Casper

Discover the top airline that operate flights from St. Louis to Casper. 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 August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$238Average$353FlexibilityNo cancel feeOn-time69%

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