How long is the flight from Illinois to Casper?

For as low as $268, United Airlines can have you in Casper from Illinois in 5h 41m. Illinois and Casper are separated by a distance of 946 mi.

In terms of precipitation, rainfall in Casper ranges from 0.5 - 2.0 inches per month. May is typically the wettest month, when rainfall can reach 2.0 in. January is typically the driest time to visit Casper when rainfall is around 0.5 in.

If weather is an important factor for your trip to Casper, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 23.0 F).

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.

What is the cheapest time of day to fly from IL to CPR?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Casper as you normally would.

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.

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.

$268+ Flights from Illinois to Casper

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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 December 18, 2025.

Wed 12/3112:45 pmORD - CPR

1 stop5h 14mUnited Airlines

Sun 1/41:22 pmCPR - ORD

1 stop8h 38mUnited Airlines

Deal found 12/15

$539

Wed 12/311:05 pmSTL - CPR

2 stops10h 20mUnited Airlines

Sun 1/41:22 pmCPR - STL

1 stop8h 00mUnited Airlines

Deal found 12/15

$610

Best flights from Illinois to Casper
Discover carefully curated flight deals from Illinois to Casper that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2025.

Fri 5/82:15 pmORD - CPR

1 stop5h 41mUnited Airlines

Mon 5/116:01 pmCPR - ORD

1 stop4h 56mUnited Airlines

Deal found 12/17

$268

Fri 1/27:10 amORD - CPR

1 stop6h 36mUnited Airlines

Tue 1/611:28 amCPR - ORD

1 stop6h 18mUnited Airlines

Deal found 12/17

$298

Wed 1/146:00 pmSTL - CPR

1 stop5h 14mUnited Airlines

Sat 1/175:30 amCPR - STL

1 stop6h 46mUnited Airlines

Deal found 12/15

$328

Thu 1/291:55 pmORD - CPR

1 stop6h 11mUnited Airlines

Sat 1/317:00 amCPR - ORD

1 stop5h 22mUnited Airlines

Deal found 12/16

$338

Thu 1/88:45 amORD - CPR

1 stop4h 50mUnited Airlines

Wed 1/1411:28 amCPR - ORD

1 stop8h 47mUnited Airlines

Deal found 12/17

$340

Thu 1/19:00 amSTL - CPR

1 stop6h 40mUnited Airlines

Mon 1/56:10 pmCPR - STL

2 stops17h 27mUnited Airlines

Deal found 12/17

$344

Wed 1/146:00 pmSTL - CPR

1 stop5h 14mUnited Airlines

Fri 1/1611:28 amCPR - STL

1 stop24h 48mUnited Airlines

Deal found 12/17

$387

Wed 12/3112:45 pmORD - CPR

1 stop5h 14mUnited Airlines

Sun 1/41:22 pmCPR - ORD

1 stop8h 38mUnited Airlines

Deal found 12/15

$539

Fri 5/2912:45 pmORD - CPR

2 stops10h 27mUnited Airlines

Mon 6/15:30 amCPR - ORD

2 stops10h 08mUnited Airlines

Deal found 12/17

$1,143

Last-minute flights from Illinois to Casper
Discover last-minute flight deals from Illinois to Casper. Data last updated December 18, 2025 and is based on user searches.

Wed 12/3112:45 pmORD - CPR

1 stop5h 14mUnited Airlines

Sun 1/41:22 pmCPR - ORD

1 stop8h 38mUnited Airlines

Deal found 12/15

$539

Wed 12/311:05 pmSTL - CPR

2 stops10h 20mUnited Airlines

Sun 1/41:22 pmCPR - STL

1 stop8h 00mUnited Airlines

Deal found 12/15

$610

Thu 1/19:00 amSTL - CPR

1 stop6h 40mUnited Airlines

Mon 1/53:19 pmCPR - STL

1 stop6h 03mUnited Airlines

Deal found 12/17

$310

Fri 1/27:10 amORD - CPR

1 stop6h 36mUnited Airlines

Tue 1/611:28 amCPR - ORD

1 stop6h 18mUnited Airlines

Deal found 12/17

$298

Thu 1/88:45 amORD - CPR

1 stop4h 50mUnited Airlines

Wed 1/1411:28 amCPR - ORD

1 stop8h 47mUnited Airlines

Deal found 12/17

$340

Wed 1/146:00 pmSTL - CPR

1 stop5h 14mUnited Airlines

Sat 1/173:17 pmCPR - STL

1 stop4h 41mUnited Airlines

Deal found 12/17

$328

Wed 1/146:00 pmSTL - CPR

1 stop5h 14mUnited Airlines

Fri 1/1611:28 amCPR - STL

1 stop24h 48mUnited Airlines

Deal found 12/17

$387

Thu 1/297:00 amORD - CPR

1 stop6h 35mUnited Airlines

Sat 1/3111:28 amCPR - ORD

1 stop6h 18mUnited Airlines

Deal found 12/17

$338

Find flight deals from Illinois to Casper

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$268 (United Airlines)
Popular in	December
Cheapest in	September
Average price	$618

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.

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From Illinois to Casper Natrona County

Search Deals

Highest demand for flights based on searches. 22% potential increase in price ($141 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Fri 5/8

2:15 pm-6:56 pm

1 stop5h 41m

Casper Natrona County

Mon 5/11

6:01 pm-11:57 pm

1 stop4h 56m

$268

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Fri 1/2

7:10 am-12:46 pm

1 stop6h 36m

Casper Natrona County

Tue 1/6

11:28 am-6:46 pm

1 stop6h 18m

$298

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 1/14

6:00 pm-10:14 pm

1 stop5h 14m

Casper Natrona County

Sat 1/17

5:30 am-1:16 pm

1 stop6h 46m

$328

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Thu 1/29

1:55 pm-7:06 pm

1 stop6h 11m

Casper Natrona County

Sat 1/31

7:00 am-1:22 pm

1 stop5h 22m

$338

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Thu 1/8

8:45 am-12:35 pm

1 stop4h 50m

Casper Natrona County

Wed 1/14

11:28 am-9:15 pm

1 stop8h 47m

$340

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Thu 1/1

9:00 am-2:40 pm

1 stop6h 40m

Casper Natrona County

Mon 1/5

6:10 pm-12:37 pm

2 stops17h 27m

$344

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 1/14

6:00 pm-10:14 pm

1 stop5h 14m

Casper Natrona County

Fri 1/16

11:28 am-1:16 pm

1 stop24h 48m

$387

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Wed 12/31

12:45 pm-4:59 pm

1 stop5h 14m

Casper Natrona County

Sun 1/4

1:22 pm-11:00 pm

1 stop8h 38m

$539

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Fri 5/29

12:45 pm-10:12 pm

2 stops10h 27m

Casper Natrona County

Mon 6/1

5:30 am-4:38 pm

2 stops10h 08m

$1,143

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

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

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 $268, United Airlines can have you in Casper from Illinois in 5h 41m. Illinois and Casper are separated by a distance of 946 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Illinois to Casper

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Top airline flying from Illinois to Casper

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$248	Average$418	FlexibilityNo cancel fee	On-time69%

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$268+ 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 5/8. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Illinois to Casper with Cheapflights

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Cheap flight deals from Illinois to Casper

Cheapest flights from Illinois to CasperExplore 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 December 18, 2025.

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 December 18, 2025.

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 December 18, 2025.

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

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Use the filters below to find and compare flights from Illinois to Casper that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Casper

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?

How long is the flight from Illinois to Casper?

What are the most popular routes from Illinois to Casper?

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

How can I find direct flights from Illinois to Casper?

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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Illinois to Casper

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Top airline flying from Illinois to Casper

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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 December 18, 2025.