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$338+ 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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.
CPR — ORD
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap 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 January 29, 2026.

This United Airlines deal was found by Cheapflights users on 1/28. 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 8/293:15 pm
CPR
-
ORD
1 stop4h 58m
United Airlines
Wed 9/27:15 am
ORD
-
CPR
1 stop6h 20m
United Airlines
Deal found 1/28$338
This United Airlines deal was found by Cheapflights users on 1/27. 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.
Fri 1/301:16 pm
CPR
-
STL
1 stop6h 42m
United Airlines
Wed 2/42:45 pm
STL
-
CPR
1 stop6h 55m
United Airlines
Deal found 1/27$343
This United Airlines deal was found by Cheapflights users on 1/27. 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 2/711:28 am
CPR
-
STL
1 stop8h 30m
United Airlines
Tue 2/104:15 pm
STL
-
CPR
1 stop5h 25m
United Airlines
Deal found 1/27$368
This United Airlines deal was found by Cheapflights users on 1/28. 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 2/125:25 am
CPR
-
ORD
1 stop4h 54m
United Airlines
Mon 2/162:02 pm
ORD
-
CPR
1 stop7h 24m
United Airlines
Deal found 1/28$394
This United Airlines deal was found by Cheapflights users on 1/26. 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 1/273:17 pm
CPR
-
STL
1 stop4h 41m
United Airlines
Sat 1/318:45 am
STL
-
CPR
1 stop4h 50m
United Airlines
Deal found 1/26$428
This United Airlines deal was found by Cheapflights users on 1/28. 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.
Sun 5/173:14 pm
CPR
-
STL
1 stop4h 29m
United Airlines
Fri 5/225:15 am
STL
-
CPR
1 stop6h 29m
United Airlines
Deal found 1/28$486
This United Airlines deal was found by Cheapflights users on 1/28. 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 3/233:15 pm
CPR
-
ORD
1 stop7h 38m
United Airlines
Fri 3/2712:50 pm
ORD
-
CPR
1 stop7h 07m
United Airlines
Deal found 1/28$620

Find flight deals from Casper to Illinois

Keep the following information in mind while searching for Casper to Illinois flight deals. Data was last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$394
(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

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 January 29, 2026.
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

Thu 2/12

5:25 am-11:19 am

1 stop4h 54m

Chicago O'Hare Intl

Mon 2/16

2:02 pm-8:26 pm

1 stop7h 24m

$394

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Mon 5/18

1:17 pm-8:43 pm

1 stop6h 26m

Lambert-St Louis

Fri 5/22

5:15 am-10:44 am

1 stop6h 29m

$486

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sun 5/17

3:14 pm-8:43 pm

1 stop4h 29m

Lambert-St Louis

Fri 5/22

5:15 am-10:44 am

1 stop6h 29m

$486

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Mon 3/23

3:15 pm-11:53 pm

1 stop7h 38m

Chicago O'Hare Intl

Fri 3/27

12:50 pm-6:57 pm

1 stop7h 07m

$620

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Fri 3/27

11:26 am-8:41 pm

1 stop8h 15m

Lambert-St Louis

Sun 3/29

6:05 pm-8:26 pm

1 stop27h 21m

$677

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

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 54m. United Airlines provides one of the quickest options available for as low as $394. 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 - Chicago O'Hare Intl or Casper Natrona County - Chicago Midway, Casper Natrona County - Lambert-St Louis 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

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