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

For as low as $258, United Airlines can have you in Casper from St. Louis in 4h 50m. 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 45% below the average price you’ll pay for this route.

In terms of precipitation, rainfall in Casper ranges from 0.5 - 2.0 inches per month. May is typically the wettest month, when rainfall can reach 2.0 in. January is typically the driest time to visit Casper when rainfall is around 0.5 in.

If weather is an important factor for your trip to Casper, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 23.0 F).

What is the cheapest time of day to fly from STL to CPR?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to Casper as you normally would.

Most accurate provider : When it comes to deals on St. Louis-Casper flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Casper flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Casper flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on St. Louis-Casper flights, Cheapflights users trust eDreams the most. eDreams 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 St. Louis-Casper flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

$258+ Flights from St. Louis to Casper

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1. Tell us where you want to go

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Cheap 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 December 21, 2025.

Mon 12/222:45 pmSTL - CPR

1 stop24h 55mUnited Airlines

Tue 12/236:10 pmCPR - STL

2 stops15h 57mUnited Airlines

Deal found 12/21

$1,506

Best flights from St. Louis to Casper
Discover carefully curated flight deals from St. Louis to Casper that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 21, 2025.

Thu 1/88:45 amSTL - CPR

1 stop4h 50mUnited Airlines

Sat 1/103:17 pmCPR - STL

1 stop4h 41mUnited Airlines

Deal found 12/18

$258

Wed 1/76:00 pmSTL - CPR

1 stop5h 14mUnited Airlines

Sat 1/103:17 pmCPR - STL

1 stop4h 41mUnited Airlines

Deal found 12/18

$263

Wed 1/216:00 pmSTL - CPR

1 stop5h 14mUnited Airlines

Sat 1/243:17 pmCPR - STL

1 stop4h 41mUnited Airlines

Deal found 12/18

$328

Last-minute flights from St. Louis to Casper
Discover last-minute flight deals from St. Louis to Casper. Data last updated December 21, 2025 and is based on user searches.

Mon 1/52:45 pmSTL - CPR

1 stop6h 56mUnited Airlines

Fri 1/96:04 pmCPR - STL

1 stop25h 54mUnited Airlines

Deal found 12/21

$477

Tue 1/68:45 amSTL - CPR

1 stop6h 57mUnited Airlines

Fri 1/96:04 pmCPR - STL

1 stop25h 54mUnited Airlines

Deal found 12/18

$432

Wed 1/76:00 pmSTL - CPR

1 stop5h 14mUnited Airlines

Sat 1/103:17 pmCPR - STL

1 stop4h 41mUnited Airlines

Deal found 12/18

$263

Thu 1/88:45 amSTL - CPR

1 stop4h 50mUnited Airlines

Sat 1/103:17 pmCPR - STL

1 stop4h 41mUnited Airlines

Deal found 12/18

$258

Thu 1/88:05 amSTL - CPR

2 stops7h 37mUnited Airlines

Fri 1/91:16 pmCPR - STL

2 stops8h 42mUnited Airlines

Deal found 12/18

$497

Wed 1/216:00 pmSTL - CPR

1 stop5h 14mUnited Airlines

Sat 1/243:17 pmCPR - STL

1 stop4h 41mUnited Airlines

Deal found 12/18

$328

Find flight deals from St. Louis to Casper

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$258 (United Airlines)
Popular in	March
Cheapest in	June

Provider with most accurate pricing for Lambert-St Louis-Casper Natrona County flight deals.

Search Deals

Provider most trusted by Cheapflights users for Lambert-St Louis-Casper Natrona County flights.

Search Deals

From Lambert-St Louis to Casper Natrona County

Search Deals

Highest demand for flights based on searches. 36% potential increase in price ($249 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 14% potential price decrease ($54 potential savings vs. average RT price).

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Thu 1/8

8:45 am-12:35 pm

1 stop4h 50m

Casper Natrona County

Sat 1/10

3:17 pm-8:58 pm

1 stop4h 41m

$258

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 1/7

6:00 pm-10:14 pm

1 stop5h 14m

Casper Natrona County

Sat 1/10

3:17 pm-8:58 pm

1 stop4h 41m

$263

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 1/21

6:00 pm-10:14 pm

1 stop5h 14m

Casper Natrona County

Sat 1/24

3:17 pm-8:58 pm

1 stop4h 41m

$328

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

Compare providers for flights from St. Louis to Casper

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Casper in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust 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 St. Louis-Casper flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Casper flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Casper flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on St. Louis-Casper flights, Cheapflights users trust eDreams the most. eDreams 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 St. Louis-Casper 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 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

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

9,099 reviews

Reviews

1 / 20

10.0

Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

United Airlines

7.4

Good

9,099 reviews

United Airlines

7.4

Good

9,099 reviews

Reviews

1 / 20

10.0

Excellent

Michelle,Dec 2025

DEN - MKE

Related info for your journey

How long is the flight from St. Louis to Casper?
For as low as $258, United Airlines can have you in Casper from St. Louis in 4h 50m. 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 45% 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for St. Louis to Casper

Top airline flying from St. Louis to Casper

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$238	Average$348	FlexibilityNo cancel fee	On-time69%

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$258+ 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 1/8. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Casper with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from St. Louis to Casper

Cheapest flights from St. Louis to CasperExplore 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 December 21, 2025.

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 December 21, 2025.

Find flight deals from St. Louis to Casper

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Casper that are best for you.

Compare providers for flights from St. Louis to Casper

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 St. Louis to Casper in December.

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.

Reviews of airlines servicing Casper

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.

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?

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

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

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

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

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.

Alternative routes for St. Louis to Casper

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from St. Louis to Casper

100% Free

Book with Flexibility

Travel Smart

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 December 21, 2025.