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

For as low as $308, United Airlines can have you in Casper from St. Louis in 6h 55m. 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 44% 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.

$308+ Flights from St. Louis to Casper

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1. Tell us where you want to go

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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 December 1, 2025.

Fri 12/1911:05 amSTL - CPR

2 stops12h 20mUnited Airlines

Thu 1/15:30 amCPR - STL

2 stops7h 56mUnited Airlines

Deal found 12/1

$334

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 1, 2025.

Wed 1/212:45 pmSTL - CPR

1 stop6h 55mUnited Airlines

Sat 1/247:00 amCPR - STL

1 stop5h 16mUnited Airlines

Deal found 11/28

$308

Tue 1/138:30 amSTL - CPR

2 stops13h 10mUnited Airlines

Sat 1/173:17 pmCPR - STL

1 stop4h 41mUnited Airlines

Deal found 12/1

$314

Fri 12/1911:05 amSTL - CPR

2 stops12h 20mUnited Airlines

Thu 1/15:30 amCPR - STL

2 stops7h 56mUnited Airlines

Deal found 12/1

$334

Last-minute flights from St. Louis to Casper
Discover last-minute flight deals from St. Louis to Casper. Data last updated December 1, 2025 and is based on user searches.

Fri 12/1911:05 amSTL - CPR

2 stops12h 20mUnited Airlines

Thu 1/15:30 amCPR - STL

2 stops7h 56mUnited Airlines

Deal found 12/1

$334

Wed 1/216:00 pmSTL - CPR

1 stop5h 14mUnited Airlines

Sat 1/243:17 pmCPR - STL

1 stop4h 41mUnited Airlines

Deal found 11/29

$308

Cheap flight deals from St. Louis to Casper

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$308 (United Airlines)
Popular in	March
Cheapest in	June
Average price	$368

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. 37% potential increase in price ($254 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 12% potential price decrease ($50 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 1/21

2:45 pm-8:40 pm

1 stop6h 55m

Casper Natrona County

Sat 1/24

7:00 am-1:16 pm

1 stop5h 16m

$308

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Tue 1/13

8:30 am-8:40 pm

2 stops13h 10m

Casper Natrona County

Sat 1/17

3:17 pm-8:58 pm

1 stop4h 41m

$314

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Fri 12/19

11:05 am-10:25 pm

2 stops12h 20m

Casper Natrona County

Thu 1/1

5:30 am-2:26 pm

2 stops7h 56m

$334

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/28

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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Casper

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

Currently, September is the cheapest month in which you can book a flight from St. Louis to Casper (average of $244). Flying from St. Louis to Casper in March is currently the most expensive (average of $763). 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.

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

9,056 reviews

Reviews

1 / 20

2.0

Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

United Airlines

7.4

Good

9,056 reviews

United Airlines

7.4

Good

9,056 reviews

Reviews

1 / 20

2.0

Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

Related info for your journey

How long is the flight from St. Louis to Casper?
For as low as $308, United Airlines can have you in Casper from St. Louis in 6h 55m. 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 44% 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, September is the cheapest month in which you can book a flight from St. Louis to Casper (average of $244). Flying from St. Louis to Casper in March is currently the most expensive (average of $763). 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

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$349	FlexibilityNo cancel fee	On-time69%

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$308+ 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 1/21. 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

Find 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 1, 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 1, 2025.

Cheap flight deals from St. Louis to Casper

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Casper

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

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?

What is the cheapest month to book a flight 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 1, 2025.