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$278+ 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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
CPR — ORD
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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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 September 16, 2025.

Round-trip from

$278
(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 September 16, 2025.

This United Airlines deal was found by Cheapflights users on 9/14. 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 9/303:12 pmCPR - ORD
1 stop7h 47mUnited Airlines
Sat 10/42:53 pmORD - CPR
1 stop6h 24mUnited Airlines
Deal found 9/14$278
This United Airlines deal was found by Cheapflights users on 9/14. 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 11/221:25 pmCPR - STL
1 stop7h 29mUnited Airlines
Fri 11/289:00 amSTL - CPR
1 stop6h 41mUnited Airlines
Deal found 9/14$300
This United Airlines deal was found by Cheapflights users on 9/14. 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 9/296:00 pmCPR - STL
1 stop4h 58mUnited Airlines
Fri 10/34:50 pmSTL - CPR
1 stop20h 51mUnited Airlines
Deal found 9/14$447
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 11/266:05 pmCPR - ORD
1 stop4h 54mUnited Airlines
Mon 12/19:30 pmORD - CPR
1 stop14h 16mUnited Airlines
Deal found 9/15$522
This United Airlines deal was found by Cheapflights users on 9/15. 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 11/256:05 pmCPR - ORD
1 stop4h 54mUnited Airlines
Sat 11/297:10 amORD - CPR
1 stop8h 31mUnited Airlines
Deal found 9/15$539
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 11/266:05 pmCPR - ORD
1 stop4h 54mUnited Airlines
Sun 11/307:10 amORD - CPR
1 stop8h 31mUnited Airlines
Deal found 9/15$626

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 September 16, 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

Tue 9/30

3:12 pm-11:59 pm

1 stop7h 47m

Chicago O'Hare Intl

Sat 10/4

2:53 pm-8:17 pm

1 stop6h 24m

$278

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 11/22

1:25 pm-9:54 pm

1 stop7h 29m

Lambert-St Louis

Fri 11/28

9:00 am-2:41 pm

1 stop6h 41m

$300

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Sat 2/28

3:15 pm-10:52 pm

1 stop6h 37m

Chicago O'Hare Intl

Tue 3/3

2:45 pm-7:02 pm

1 stop5h 17m

$318

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 3/7

7:00 am-4:26 pm

1 stop8h 26m

Lambert-St Louis

Wed 3/11

9:13 am-2:40 pm

1 stop6h 27m

$338

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Mon 9/29

6:00 pm-11:58 pm

1 stop4h 58m

Lambert-St Louis

Fri 10/3

4:50 pm-12:41 pm

1 stop20h 51m

$447

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Wed 11/26

6:05 pm-11:59 pm

1 stop4h 54m

Chicago O'Hare Intl

Mon 12/1

9:30 pm-10:46 am

1 stop14h 16m

$522

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Tue 11/25

6:05 pm-11:59 pm

1 stop4h 54m

Chicago O'Hare Intl

Sat 11/29

7:10 am-2:41 pm

1 stop8h 31m

$539

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Wed 11/26

6:05 pm-11:59 pm

1 stop4h 54m

Chicago O'Hare Intl

Sun 11/30

7:10 am-2:41 pm

1 stop8h 31m

$626

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

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 September 16, 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
8,924 reviews

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

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
8,924 reviews
United Airlines
7.4
Good
8,924 reviews

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

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.

  • How long is the flight from Casper to Illinois?

    A quick flight from Casper to Illinois can take about 7h 47m. United Airlines provides one of the quickest options available for as low as $278. 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.

  • 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

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