HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$318+ 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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
CPR — ORD
Dec 2 — Dec 91
Tue 12/2
Tue 12/9
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 November 2, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$318
(United Airlines)
Provider with most accurate pricing for Casper Natrona County-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Casper Natrona County-Chicago (CHI) flights.
Search Deals
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 November 2, 2025.

This United Airlines deal was found by Cheapflights users on 10/31. 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.
Sat 11/13:18 pmCPR - STL
1 stop5h 36mUnited Airlines
Tue 11/49:00 amSTL - CPR
1 stop6h 41mUnited Airlines
Deal found 10/31$428
This United Airlines deal was found by Cheapflights users on 11/1. 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.
Tue 11/255:30 amCPR - ORD
1 stop8h 18mUnited Airlines
Tue 12/22:40 pmORD - CPR
1 stop8h 35mUnited Airlines
Deal found 11/1$449

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 November 2, 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

Sat 2/28

6:08 pm-11:59 pm

1 stop4h 51m

Chicago O'Hare Intl

Tue 3/3

7:10 am-2:40 pm

1 stop8h 30m

$318

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Tue 11/25

5:30 am-2:48 pm

1 stop8h 18m

Chicago O'Hare Intl

Tue 12/2

2:40 pm-10:15 pm

1 stop8h 35m

$449

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

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.

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.

  • How long is the flight from Casper to Illinois?

    A quick flight from Casper to Illinois can take about 4h 51m. United Airlines provides one of the quickest options available for as low as $318. Airlines will cover a distance of 946 mi.

  • 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.

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 John F Kennedy Intl flights
Denver to LaGuardia flights
Denver to Orlando flights
Denver to Newark flights
Denver to O'Hare Intl flights
Denver to Miami flights
Salt Lake City to Los Angeles flights
Denver to Los Angeles flights
Denver to Dallas/Fort Worth flights
Denver to Seattle flights
Denver to Sky Harbor Intl flights
Salt Lake City to Dallas/Fort Worth flights
Denver to San Francisco flights
Salt Lake City to Las Vegas flights
Denver to Tampa flights
Denver to Ontario flights
Denver to Hobby flights
Salt Lake City to Seattle flights
Denver to Philadelphia flights
Denver to Boston flights
Denver to Atlanta flights
Denver to Minneapolis flights
Denver to Fort Lauderdale flights
Denver to New Orleans flights
Salt Lake City to Sky Harbor Intl flights
Denver to Baltimore flights
Denver to Honolulu flights
Denver to Midway flights
Salt Lake City to Honolulu flights
Salt Lake City to John F Kennedy Intl flights
Denver to San Diego flights
Denver to Dulles Intl flights
Denver to George Bush Intcntl flights
Denver to Charlotte flights
Salt Lake City to Orlando flights
Denver to Raleigh flights
Denver to Santa Ana flights
Salt Lake City to Denver flights
Denver to Fort Myers flights
Denver to Reagan-National flights
Denver to Nashville flights
Denver to Portland flights
Denver to Austin flights
Denver to Salt Lake City flights
Denver to Detroit flights
Denver to Kahului flights
Salt Lake City to San Diego flights
Salt Lake City to Miami flights
Salt Lake City to Newark flights

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.