HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$248+ Cheap flights from Casper (CPR) to Illinois

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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
CPR — ORD
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Casper to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Casper to Illinois

Keep the following information in mind while searching for Casper to Illinois flight deals. Data was last updated July 30, 2025.

Round-trip from

$248
(United Airlines)
From Casper Natrona County to Illinois
Search Deals

Find flight deals from Casper to Illinois

Cheapest flights from Casper to Illinois
Explore the most affordable flight options available from Casper to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

This United Airlines deal was found by Cheapflights users on 7/29. 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.
Mon 9/85:50 pmCPR - ORD
1 stop5h 09mUnited Airlines
Mon 9/152:53 pmORD - CPR
1 stop5h 16mUnited Airlines
Deal found 7/29$248
This United Airlines deal was found by Cheapflights users on 7/30. 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 8/145:59 pmCPR - STL
1 stop5h 00mUnited Airlines
Mon 8/184:45 pmSTL - CPR
1 stop6h 29mUnited Airlines
Deal found 7/30$318

Cheapflights Fare Finder

 
Customize your flight search to find flights from Casper to Illinois 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 July 30, 2025.
Use the filters below to find and compare flights from Casper to Illinois that are best for you.

Fly from

Casper

Fly to

Illinois

Route

Depart

Return

Price

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Mon 9/8

5:50 pm-11:59 pm

1 stop5h 09m

Chicago O'Hare Intl

Mon 9/15

2:53 pm-7:09 pm

1 stop5h 16m

$248

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Thu 8/14

5:59 pm-11:59 pm

1 stop5h 00m

Lambert-St Louis

Mon 8/18

4:45 pm-10:14 pm

1 stop6h 29m

$318

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Best time to book a flight from Casper to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Casper 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 Casper to Illinois
No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated July 30, 2025.
Get a feel of what it's like to fly with United Airlines from Casper to Illinois by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,896 reviews

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Entertainment

7.1

Food

6.6

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
8,896 reviews
United Airlines
7.4
Good
8,896 reviews

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Entertainment

7.1

Food

6.6

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 Casper to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Casper to Illinois?

    Casper Natrona County (CPR), located 8.1 mi from the city center, is the airport you fly out of when you book flights from Casper to Illinois.

  • What are the most popular routes from Casper to Illinois?

    While some choose either Casper Natrona County - Lambert-St Louis or Casper Natrona County - Chicago Midway, Casper Natrona County - Chicago O'Hare Intl is the most popular route from Casper to Illinois.

  • Can I find deals for flights from Casper to Illinois that include hotel bookings?

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

  • How can I find direct flights from Casper to Illinois?

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

  • Can I find deals for business class flights from Casper to Illinois?

    Yes. Cheapflights offers flight deals from Casper to Illinois 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 Casper to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Casper to Illinois (average of $245). Flying from Casper to Illinois in March is currently the most expensive (average of $321). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Casper to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Denver to Las Vegas flights
Denver to Seattle flights
Denver to LaGuardia flights
Denver to Newark flights
Denver to San Francisco flights
Denver to O'Hare Intl flights
Salt Lake City to Los Angeles flights
Denver to Orlando flights
Denver to John F Kennedy Intl flights
Denver to Philadelphia flights
Denver to Hobby flights
Denver to Honolulu flights
Denver to San Diego flights
Denver to Dallas/Fort Worth flights
Denver to Miami flights
Salt Lake City to Seattle flights
Denver to Boston flights
Denver to George Bush Intcntl flights
Denver to Baltimore flights
Denver to Los Angeles flights
Denver to Reagan-National flights
Denver to Sky Harbor Intl flights
Denver to Minneapolis flights
Denver to Detroit flights
Salt Lake City to Boston flights
Denver to Portland flights
Denver to Ontario flights
Salt Lake City to John F Kennedy Intl flights
Salt Lake City to Newark flights
Denver to Tampa flights
Salt Lake City to San Diego flights
Denver to Nashville flights
Salt Lake City to Las Vegas flights
Salt Lake City to Honolulu flights
Denver to Dulles Intl flights
Denver to Charlotte flights
Denver to Kailua-Kona flights
Denver to Kansas City flights
Denver to Santa Ana flights
Denver to Fort Lauderdale flights
Denver to Raleigh flights
Denver to Austin flights
Denver to Midway flights
Salt Lake City to Dallas/Fort Worth flights
Denver to Kahului flights
Denver to Cleveland flights
Denver to Atlanta flights
Salt Lake City to O'Hare Intl flights
Denver to Grand Rapids flights
Salt Lake City to Santa Ana flights

Top airline flying from Casper to Illinois

Discover the top airline that operate flights from Casper to Illinois. 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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$318Average$418FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.