CPR - STL

$280 Find Cheap Flights from Casper to St. Louis

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Casper to St. Louis departing on 11/13. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Casper to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Casper to St. Louis, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$280
United Airlines
Thu 11/13Mon 11/17
CPR - STL • 1 stop
Cheapest one-way
Multiple Airlines
Thu 10/30
CPR - STL • multi-stop
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We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Casper to St. Louis (CPR-STL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Casper to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Casper to St. Louis

Thu, Nov 13 - Mon, Nov 17
United Airlines Logo
11:20 am - 4:28 pmCPR-STL
4h 08m1 stop
United Airlines Logo
4:43 pm - 9:58 pmSTL-CPR
6h 15m1 stop
$280United Airlines
Find Deal
Thu, Nov 13 - Mon, Nov 17
United Airlines Logo
1:25 pm - 10:45 pmCPR-STL
8h 20m2 stops
United Airlines Logo
4:43 pm - 9:58 pmSTL-CPR
6h 15m1 stop
$285United Airlines
Find Deal
Thu, Nov 13 - Mon, Nov 17
United Airlines Logo
1:25 pm - 10:45 pmCPR-STL
8h 20m2 stops
United Airlines Logo
3:14 pm - 9:58 pmSTL-CPR
7h 44m2 stops
$342United Airlines
Find Deal
Sat, Mar 7 - Wed, Mar 11
United Airlines Logo
11:30 am - 8:54 pmCPR-STL
8h 24m1 stop
United Airlines Logo
3:00 pm - 6:59 pmSTL-CPR
4h 59m1 stop
$343United Airlines
Find Deal
Sat, Mar 7 - Wed, Mar 11
United Airlines Logo
8:55 am - 9:00 pmCPR-STL
11h 05m2 stops
United Airlines Logo
3:00 pm - 8:30 pmSTL-CPR
6h 30m1 stop
$349United Airlines
Find Deal
Sat, Mar 7 - Wed, Mar 11
United Airlines Logo
11:30 am - 8:54 pmCPR-STL
8h 24m1 stop
United Airlines Logo
3:00 pm - 6:59 pmSTL-CPR
4h 59m1 stop
$353United Airlines
Find Deal
Sat, Mar 7 - Wed, Mar 11
United Airlines Logo
5:30 am - 2:31 pmCPR-STL
8h 01m2 stops
United Airlines Logo
10:00 am - 6:59 pmSTL-CPR
9h 59m2 stops
$354United Airlines
Find Deal
Sat, Mar 7 - Wed, Mar 11
United Airlines Logo
11:30 am - 8:54 pmCPR-STL
8h 24m1 stop
United Airlines Logo
10:00 am - 6:59 pmSTL-CPR
9h 59m2 stops
$359United Airlines
Find Deal
Sat, Mar 7 - Wed, Mar 11
United Airlines Logo
5:30 am - 2:31 pmCPR-STL
8h 01m2 stops
United Airlines Logo
8:00 am - 5:04 pmSTL-CPR
10h 04m2 stops
$364United Airlines
Find Deal
Mon, Nov 17 - Mon, Nov 24
United Airlines Logo
6:05 pm - 9:54 pmCPR-STL
26h 49m1 stop
United Airlines Logo
1:35 pm - 7:17 pmSTL-CPR
6h 42m1 stop
$397United Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for Casper to St. Louis flights

Get data-powered insights and trends into flights from Casper to St. Louis to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Casper to St. Louis?

The average price of all round-trip flights from Casper to St. Louis clicked on KAYAK for each day over the last 12 months.

For Casper to St. Louis, Thursday is the cheapest day to fly on average and Saturday is the most expensive. Flying from St. Louis back to Casper, the best deals are generally found on Saturday, with Tuesday being the most expensive.

Good to know

Cheapest flight$280
Flight from Casper to St. Louis

When to book flights from Casper to St. Louis

Are your dates flexible? Find out the best times to travel from Casper to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Casper to St. Louis

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

    In the last 3 days, the lowest price for a flight from Casper to St. Louis was $280 for a round-trip ticket.

  • Do I need a passport to fly between Casper and St. Louis?

    A passport is not required to fly from Casper to St. Louis.

  • Which airports will I be using when flying from Casper to St. Louis?

    Casper and St. Louis are both served by 1 main airport. You will leave Casper from Casper Natrona County and will be arriving at Lambert-St Louis.

  • Which aircraft models fly most regularly from Casper to St. Louis?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Casper to St. Louis?

    Star Alliance is the only airline alliance operating flights between Casper and St. Louis.

  • How does KAYAK find such low prices on flights from Casper to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Casper to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Casper to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Casper is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Casper to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Casper with another airline. Booking your flights between Casper and STL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Casper to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Casper up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Casper to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Casper to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Casper to St. Louis? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 8999 reviews
7.3Comfort
6.6Food
7.1Entertainment
7.7Boarding
8.1Crew
Airline reviews

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

10.0 ExcellentDr. Joseph, Oct 2025STL - ORD
Read more United Airlines reviews

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

The person I bought the ticket for didn’t make the flight.

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

Excellent flight. Smooth, efficient boarding. Quick flight. Arrived early at STL.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

During booking, I kept trying submitting my payment from the Mexican website and it didn't work. After I had the idea to change it to the Canadian website, it worked but I had to be charged the equivalent of 50 CAD more. I received the clear instruction that I would only be able to check-in at the airport and that it was impossible to select a seat 24 hours before departure, that I had to pay 144 CAD to do so, although not only was I able to check-in 24 hours before departure, but I could have selected my seats for free then. All in all, I almost threw $200 out the window due to misleading information. Besides, the app kept crashing, the information to get to the gate on the app was inaccurate, my gate was switched and I was only informed once in the air (luckily I had noticed the departure pannel), I was not addressed in my language beforehand and even if I tried I was immediately answered in English (which meant the crew understood but didn't want to answer accordingly), there was only one snack & beverage service on my medium haul flight and no beverage service on my short haul flight. To be fair, the planes were comfortable, the crew apart from the language issue was helpful, dynamic and engaging, the plane was clean and the directions were clear and direct. United has a lot of potential to be one of my favourite airlines, but the devil is in the details and a lot of them missed the target.

Flight was timely, relatively comfortable, with decent entertainment and food served. Only problem encountered was with the free messaging which I highly appreciate, but it did not work from iphone to non-iphones.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

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

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