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Casper

$258+ Cheap flights from Illinois to Casper (CPR)

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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — CPR
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from Illinois to Casper

Cheapest flights from Illinois to Casper
Explore the most affordable flight options available from Illinois to Casper. 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.
Wed 2/256:00 pm
STL
-
CPR
1 stop5h 09m
United Airlines
Wed 3/43:15 pm
CPR
-
STL
1 stop7h 06m
United Airlines
Deal found 1/28$258
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.
Wed 2/112:45 pm
STL
-
CPR
1 stop6h 56m
United Airlines
Sat 2/141:20 pm
CPR
-
STL
1 stop6h 06m
United Airlines
Deal found 1/28$268
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.
Fri 8/282:18 pm
ORD
-
CPR
1 stop5h 14m
United Airlines
Mon 8/316:01 pm
CPR
-
ORD
1 stop4h 56m
United Airlines
Deal found 1/28$293
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 2/103:59 pm
ORD
-
CPR
1 stop5h 41m
United Airlines
Sat 2/1411:26 am
CPR
-
ORD
1 stop6h 21m
United Airlines
Deal found 1/26$298
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.
Fri 5/12:20 pm
ORD
-
CPR
1 stop5h 37m
United Airlines
Mon 5/43:14 pm
CPR
-
ORD
1 stop6h 44m
United Airlines
Deal found 1/28$309
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.
Tue 4/288:54 am
STL
-
CPR
1 stop6h 45m
United Airlines
Sat 5/29:00 am
CPR
-
STL
1 stop4h 28m
United Airlines
Deal found 1/28$328
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 4/301:43 pm
ORD
-
CPR
1 stop6h 14m
United Airlines
Mon 5/46:10 pm
CPR
-
ORD
1 stop5h 48m
United Airlines
Deal found 1/28$330
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.
Wed 10/283:00 pm
ORD
-
CPR
1 stop6h 17m
United Airlines
Sat 10/311:25 pm
CPR
-
ORD
1 stop8h 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.
Thu 2/192:02 pm
ORD
-
CPR
1 stop6h 00m
United Airlines
Wed 2/253:15 pm
CPR
-
ORD
1 stop5h 14m
United Airlines
Deal found 1/27$340
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.
Fri 3/66:05 pm
STL
-
CPR
1 stop4h 54m
United Airlines
Sun 3/85:25 am
CPR
-
STL
2 stops8h 17m
United Airlines
Deal found 1/28$354
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 1/314:15 pm
STL
-
CPR
1 stop6h 59m
United Airlines
Mon 2/21:16 pm
CPR
-
STL
1 stop6h 42m
United Airlines
Deal found 1/27$358
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 3/288:40 am
ORD
-
CPR
1 stop9h 22m
United Airlines
Fri 4/35:55 pm
CPR
-
ORD
2 stops19h 45m
United Airlines
Deal found 1/27$767

Find flight deals from Illinois to Casper

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

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$258
(United Airlines)
Provider with most accurate pricing for Chicago (CHI)-Casper Natrona County flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Casper Natrona County flights.
Search Deals
From Illinois to Casper Natrona County
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Casper 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 Illinois to Casper that are best for you.

Fly from

Illinois

Fly to

Casper

Route

Depart

Return

Price

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Fri 3/6

6:05 pm-9:59 pm

1 stop4h 54m

Casper Natrona County

Sun 3/8

6:09 pm-11:34 pm

1 stop4h 25m

$258

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 2/25

6:00 pm-10:09 pm

1 stop5h 09m

Casper Natrona County

Wed 3/4

1:20 pm-10:14 pm

2 stops7h 54m

$264

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 2/11

2:45 pm-8:41 pm

1 stop6h 56m

Casper Natrona County

Sat 2/14

1:20 pm-8:26 pm

1 stop6h 06m

$268

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Tue 2/10

3:59 pm-8:40 pm

1 stop5h 41m

Casper Natrona County

Sat 2/14

11:26 am-6:47 pm

1 stop6h 21m

$298

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Fri 5/1

2:20 pm-6:57 pm

1 stop5h 37m

Casper Natrona County

Mon 5/4

3:14 pm-10:58 pm

1 stop6h 44m

$309

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Tue 4/28

4:30 pm-10:07 pm

1 stop6h 37m

Casper Natrona County

Sat 5/2

9:00 am-2:28 pm

1 stop4h 28m

$328

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Thu 4/30

1:43 pm-6:57 pm

1 stop6h 14m

Casper Natrona County

Mon 5/4

6:10 pm-12:58 am

1 stop5h 48m

$330

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Thu 2/19

2:02 pm-7:02 pm

1 stop6h 00m

Casper Natrona County

Wed 2/25

3:15 pm-9:29 pm

1 stop5h 14m

$340

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Sat 3/28

8:40 am-5:02 pm

1 stop9h 22m

Casper Natrona County

Fri 4/3

5:55 pm-2:40 pm

2 stops19h 45m

$767

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Sat 3/14

7:00 am-8:36 pm

2 stops14h 36m

$284

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Showing 1-10 of 12 results
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Best time to book a flight from Illinois to Casper

Have a flexible travel schedule? Discover the best time to fly to Casper from Illinois 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 Illinois to Casper
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 Illinois to Casper. 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 into for flights to Casper from Illinois?

    Most people fly into Casper Natrona County (CPR) if they book a flight to Casper from Illinois. Natrona County is conveniently located just 8.1 mi from Casper’s city center.

  • How long is the flight from Illinois to Casper?

    For as low as $258, United Airlines can have you in Casper from Illinois in 4h 54m. Illinois and Casper are separated by a distance of 887 mi.

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

    The most popular route from Illinois to Casper is Chicago O'Hare Intl - Casper Natrona County. You may also consider Lambert-St Louis - Casper Natrona County or Chicago Midway - Casper Natrona County.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Illinois to Casper 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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Alternative routes for Illinois to Casper

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Illinois to Casper

Discover the top airline that operate flights from Illinois to Casper. 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$248Average$418FlexibilityNo cancel feeOn-time69%

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