What is the cheapest airline that flies from Casper Natrona County to Illinois?

United Airlines is the most popular carrier operating from Casper Natrona County to Illinois

When did momondo last update prices for flights from Casper Natrona County Airport to Illinois?

Prices for flights from Casper Natrona County Airport to Illinois are updated daily.

How many operators does momondo search for flights from Casper Natrona County Airport to Illinois?

There is 1 operator available for flights from Casper Natrona County Airport to Illinois as of April 2026.

How old do you have to be to fly from Casper Natrona County Airport to Illinois?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Casper Natrona County Airport to Illinois.

What documentation or ID do you need to fly to Illinois?

The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$308 Cheap Flights from Casper to Illinois in 2026

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0 bags

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Find the cheapest flights from Casper to Illinois

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:10 pm - 11:57 pm

CPR

ORD

4h 47m

1 stop

5:00 am - 8:51 am

ORD

CPR

4h 51m

1 stop

$328United Airlines

Wed, May 20 - Mon, May 25

11:22 am - 5:04 pm

CPR

ORD

4h 42m

1 stop

4:10 pm - 10:10 pm

ORD

CPR

7h 00m

1 stop

$358United Airlines

Tue, Apr 28 - Sat, May 2

6:13 pm - 12:44 am

CPR

ORD

5h 31m

1 stop

5:00 am - 8:51 am

ORD

CPR

4h 51m

1 stop

$370United Airlines

Fri, Jun 5 - Sun, Jun 7

6:10 pm - 12:58 am

CPR

ORD

5h 48m

1 stop

3:00 pm - 6:57 pm

ORD

CPR

4h 57m

1 stop

$385United Airlines

Thu, Apr 30 - Mon, May 4

11:15 am - 9:39 pm

CPR

ORD

9h 24m

1 stop

5:00 am - 10:46 am

ORD

CPR

6h 46m

1 stop

$408United Airlines

Sat, Jun 20 - Fri, Jun 26

6:13 pm - 12:44 am

CPR

ORD

5h 31m

1 stop

5:00 am - 8:51 am

ORD

CPR

4h 51m

1 stop

$428United Airlines

Thu, May 21 - Sat, May 23

3:14 pm - 8:43 pm

CPR

STL

4h 29m

1 stop

4:15 pm - 10:10 pm

STL

CPR

6h 55m

1 stop

$437United Airlines

Fri, May 1 - Sat, May 16

9:00 am - 8:43 pm

CPR

STL

10h 43m

1 stop

5:10 am - 8:51 am

STL

CPR

4h 41m

1 stop

$483United Airlines

Wed, May 20 - Mon, May 25

3:14 pm - 12:24 am

CPR

STL

8h 10m

2 stops

4:15 pm - 8:17 pm

STL

CPR

5h 02m

1 stop

$522United Airlines

Fri, May 1 - Sat, May 16

1:23 pm - 8:44 pm

CPR

ORD

6h 21m

1 stop

5:00 am - 8:51 am

ORD

CPR

4h 51m

1 stop

$534United Airlines

Mon, Jun 22 - Sat, Jun 27

United Airlines flights from Casper to Illinois

Our best United Airlines deals on Casper to Illinois flight tickets

United Airlines

May 20

CPR6:10 pmCasper Natrona County

4h 47m

1 stop

ORD11:57 pmChicago O'Hare Intl

May 25

ORD5:00 amChicago O'Hare Intl

4h 51m

1 stop

CPR8:51 amCasper Natrona County

$328

United Airlines

Apr 28

CPR11:22 amCasper Natrona County

4h 42m

1 stop

ORD5:04 pmChicago O'Hare Intl

May 2

ORD4:10 pmChicago O'Hare Intl

7h 00m

1 stop

CPR10:10 pmCasper Natrona County

$358

United Airlines

Jun 5

CPR6:13 pmCasper Natrona County

5h 31m

1 stop

ORD12:44 amChicago O'Hare Intl

Jun 7

ORD5:00 amChicago O'Hare Intl

4h 51m

1 stop

CPR8:51 amCasper Natrona County

$370

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Wed 5/20

6:10 pm-11:57 pm

1 stop4h 47m

Chicago O'Hare Intl

Mon 5/25

5:00 am-8:51 am

1 stop4h 51m

$328

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Tue 4/28

11:22 am-5:04 pm

1 stop4h 42m

Chicago O'Hare Intl

Sat 5/2

4:10 pm-10:10 pm

1 stop7h 00m

$358

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Fri 6/5

6:13 pm-12:44 am

1 stop5h 31m

Chicago O'Hare Intl

Sun 6/7

5:00 am-8:51 am

1 stop4h 51m

$370

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Thu 4/30

6:10 pm-12:58 am

1 stop5h 48m

Chicago O'Hare Intl

Mon 5/4

3:00 pm-6:57 pm

1 stop4h 57m

$385

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Sat 6/20

11:15 am-9:39 pm

1 stop9h 24m

Chicago O'Hare Intl

Fri 6/26

5:00 am-10:46 am

1 stop6h 46m

$408

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Thu 5/21

6:13 pm-12:44 am

1 stop5h 31m

Chicago O'Hare Intl

Sat 5/23

5:00 am-8:51 am

1 stop4h 51m

$428

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Fri 5/1

3:14 pm-8:43 pm

1 stop4h 29m

Lambert-St Louis

Sat 5/16

4:15 pm-10:10 pm

1 stop6h 55m

$437

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Wed 5/20

9:00 am-8:43 pm

1 stop10h 43m

Lambert-St Louis

Mon 5/25

5:10 am-8:51 am

1 stop4h 41m

$483

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Fri 5/1

3:14 pm-12:24 am

2 stops8h 10m

Lambert-St Louis

Sat 5/16

4:15 pm-8:17 pm

1 stop5h 02m

$522

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Mon 6/22

1:23 pm-8:44 pm

1 stop6h 21m

Chicago O'Hare Intl

Sat 6/27

5:00 am-8:51 am

1 stop4h 51m

$534

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first

How to get the cheapest flight ticket from Casper to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Can stopping save me money on Casper to Illinois flights?

You could potentially save up to 35% on your flight if you consider stops on a Casper to Illinois flight.

Cheap Casper to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Casper to Illinois

Fastest flight time	4h 29m
Direct flights	None

The fastest flight from Casper to Illinois takes 4h 29m

There are no direct flights from Casper to Illinois. There are no popular flight routes from Casper to Illinois.

Search flight deals

Frequently asked questions about flying from Casper to Illinois

When did momondo last update prices for flights from Casper Natrona County Airport to Illinois?
Prices for flights from Casper Natrona County Airport to Illinois are updated daily.
How many operators does momondo search for flights from Casper Natrona County Airport to Illinois?
There is 1 operator available for flights from Casper Natrona County Airport to Illinois as of April 2026.
How old do you have to be to fly from Casper Natrona County Airport to Illinois?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Casper Natrona County Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from Casper to Illinois?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Casper to Illinois. momondo saves you time and could save you money on your trip.

Can I find flights from Casper to Illinois with flexible booking policies on momondo?

Flights from Casper to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Casper to Illinois?

momondo provides multiple filters to help you find the best flight to Illinois from Casper. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Casper to Illinois right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Illinois from Casper. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.