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

For as low as $314, United Airlines can have you in Casper from St. Louis in 6h 32m. 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.

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 $500). 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.

What is the cheapest day to fly from St. Louis to Casper?

Travelers seeking maximum savings on their St. Louis to Casper flight should consider departing on Saturday afternoons when fares are most often at their lowest. Tuesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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?

It’s typically best to fly out from St. Louis to Casper at noon. Doing so could potentially save you 19% on the flight price compared to flying in the afternoon, which is usually more expensive.

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.

$313+ Cheap Flights from St. Louis to Casper

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Cheap flight deals from St. Louis to Casper

Round-trip from	$314 (United Airlines)
Popular in	March
Cheapest in	September
Average price	$238

From Lambert-St Louis to Casper Natrona County

Search Deals

Highest demand for flights based on searches. 37% potential increase in price ($258 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 14% potential price decrease ($55 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

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 September 17, 2025.

Mon 9/151:39 pmSTL - CPR

1 stop6h 30mUnited Airlines

Mon 9/225:50 pmCPR - STL

1 stop5h 03mUnited Airlines

Deal found 9/14

$313

Wed 10/15:15 amSTL - CPR

1 stop6h 32mUnited Airlines

Sun 10/56:00 pmCPR - STL

1 stop4h 58mUnited Airlines

Deal found 9/15

$314

Mon 10/135:15 amSTL - CPR

1 stop14h 32mUnited Airlines

Mon 10/203:12 pmCPR - STL

1 stop7h 46mUnited Airlines

Deal found 9/15

$394

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 September 17, 2025.

Wed 10/15:15 amSTL - CPR

1 stop6h 32mUnited Airlines

Sun 10/56:00 pmCPR - STL

1 stop4h 58mUnited Airlines

Deal found 9/15

$314

Mon 10/135:15 amSTL - CPR

1 stop14h 32mUnited Airlines

Mon 10/203:12 pmCPR - STL

1 stop7h 46mUnited Airlines

Deal found 9/15

$394

Last-minute flights from St. Louis to Casper
Discover last-minute flight deals from St. Louis to Casper. Data last updated September 17, 2025 and is based on user searches.

Sun 9/219:00 amSTL - CPR

1 stop8h 52mUnited Airlines

Tue 9/235:50 pmCPR - STL

1 stop17h 53mUnited Airlines

Deal found 9/17

$861

Wed 10/15:15 amSTL - CPR

1 stop6h 32mUnited Airlines

Sun 10/56:00 pmCPR - STL

1 stop4h 58mUnited Airlines

Deal found 9/15

$314

Thu 10/26:30 amSTL - CPR

2 stops14h 47mUnited Airlines

Mon 10/67:00 amCPR - STL

2 stops13h 37mUnited Airlines

Deal found 9/17

$974

Fly from

Fly to

Route

Depart

Return

Price

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 10/1

5:15 am-10:47 am

1 stop6h 32m

Casper Natrona County

Sun 10/5

6:00 pm-11:58 pm

1 stop4h 58m

$314

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Mon 10/13

5:15 am-6:47 pm

1 stop14h 32m

Casper Natrona County

Mon 10/20

3:12 pm-11:58 pm

1 stop7h 46m

$394

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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

8,926 reviews

Reviews

1 / 20

10.0

Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.

United Airlines

7.4

Good

8,926 reviews

United Airlines

7.4

Good

8,926 reviews

Reviews

1 / 20

10.0

Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.

Related info for your journey

How long is the flight from St. Louis to Casper?
For as low as $314, United Airlines can have you in Casper from St. Louis in 6h 32m. 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, 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 $500). 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

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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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$313+ 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 9/15. 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

Round-trip from

Popular in

Cheapest in

Average price

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 September 17, 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 September 17, 2025.

Cheapflights Fare Finder

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

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?

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

Traveling to a place near Casper?

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Alternative routes for St. Louis to Casper

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Top airline flying from St. Louis to Casper

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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 September 17, 2025.