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 July 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.

$281 Cheap Flights from Casper to Illinois in 2026

Find the cheapest flights from Casper to Illinois

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:13 pm - 11:57 pm

CPR

STL

4h 44m

1 stop

5:10 am - 10:46 am

STL

CPR

6h 36m

1 stop

$298United Airlines

Thu, Aug 6 - Sun, Aug 9

6:13 pm - 12:44 am

CPR

ORD

5h 31m

1 stop

5:00 am - 8:51 am

ORD

CPR

4h 51m

1 stop

$308United Airlines

Fri, Jul 31 - Tue, Aug 4

6:00 pm - 11:59 pm

CPR

ORD

4h 59m

1 stop

5:00 am - 8:59 am

ORD

CPR

4h 59m

1 stop

$371United Airlines

Fri, Oct 9 - Mon, Oct 12

11:21 am - 8:43 pm

CPR

STL

8h 22m

1 stop

5:10 am - 8:51 am

STL

CPR

4h 41m

1 stop

$378United Airlines

Wed, Aug 5 - Sun, Aug 9

7:05 am - 4:34 pm

CPR

STL

8h 29m

1 stop

10:53 am - 8:27 pm

STL

CPR

10h 34m

2 stops

$384United Airlines

Sat, Aug 22 - Tue, Aug 25

11:24 am - 7:30 pm

CPR

ORD

7h 06m

1 stop

12:45 pm - 5:18 pm

ORD

CPR

5h 33m

1 stop

$388United Airlines

Sat, Aug 29 - Tue, Sep 1

10:01 am - 10:00 pm

CPR

STL

10h 59m

2 stops

8:50 am - 7:09 pm

STL

CPR

11h 19m

2 stops

$389United Airlines

Sat, Aug 22 - Tue, Aug 25

3:15 pm - 10:49 pm

CPR

ORD

6h 34m

1 stop

6:00 am - 10:46 am

ORD

CPR

5h 46m

1 stop

$389United Airlines

Sat, Aug 1 - Fri, Aug 7

6:00 pm - 11:44 pm

CPR

STL

4h 44m

1 stop

1:36 pm - 7:09 pm

STL

CPR

6h 33m

1 stop

$394United Airlines

Thu, Sep 24 - Tue, Sep 29

6:00 pm - 11:44 pm

CPR

STL

4h 44m

1 stop

11:35 am - 7:09 pm

STL

CPR

8h 34m

2 stops

$415United Airlines

Thu, Sep 24 - Tue, Sep 29

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United Airlines flights from Casper to Illinois

Our best United Airlines deals on Casper to Illinois flight tickets

United Airlines

Jul 31

CPR6:13 pmCasper Natrona County

5h 31m

1 stop

ORD12:44 amChicago O'Hare Intl

Aug 4

ORD5:00 amChicago O'Hare Intl

4h 51m

1 stop

CPR8:51 amCasper Natrona County

$308

United Airlines

Oct 3

CPR1:26 pmCasper Natrona County

6h 10m

1 stop

STL8:36 pmLambert-St Louis

Oct 8

STL5:10 amLambert-St Louis

4h 49m

1 stop

CPR8:59 amCasper Natrona County

$314

United Airlines

Oct 9

CPR6:00 pmCasper Natrona County

4h 59m

1 stop

ORD11:59 pmChicago O'Hare Intl

Oct 12

ORD5:00 amChicago O'Hare Intl

4h 59m

1 stop

CPR8:59 amCasper Natrona County

$371

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Thu 8/6

6:13 pm-11:57 pm

1 stop4h 44m

Lambert-St Louis

Sun 8/9

5:10 am-10:46 am

1 stop6h 36m

$298

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Fri 7/31

6:13 pm-12:44 am

1 stop5h 31m

Chicago O'Hare Intl

Tue 8/4

5:00 am-8:51 am

1 stop4h 51m

$308

Quickest round-trip

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Fri 10/9

6:00 pm-11:59 pm

1 stop4h 59m

Chicago O'Hare Intl

Mon 10/12

5:00 am-8:59 am

1 stop4h 59m

$371

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Wed 8/5

11:21 am-8:43 pm

1 stop8h 22m

Lambert-St Louis

Sun 8/9

5:10 am-8:51 am

1 stop4h 41m

$378

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 8/22

7:05 am-4:34 pm

1 stop8h 29m

Lambert-St Louis

Tue 8/25

10:53 am-8:27 pm

2 stops10h 34m

$384

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Sat 8/29

11:24 am-7:30 pm

1 stop7h 06m

Chicago O'Hare Intl

Tue 9/1

12:45 pm-5:18 pm

1 stop5h 33m

$388

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 8/22

10:01 am-10:00 pm

2 stops10h 59m

Lambert-St Louis

Tue 8/25

8:50 am-7:09 pm

2 stops11h 19m

$389

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Sat 8/1

3:15 pm-10:49 pm

1 stop6h 34m

Chicago O'Hare Intl

Fri 8/7

6:00 am-10:46 am

1 stop5h 46m

$389

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Thu 9/24

6:00 pm-11:44 pm

1 stop4h 44m

Lambert-St Louis

Tue 9/29

1:36 pm-7:09 pm

1 stop6h 33m

$394

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Thu 9/24

6:00 pm-11:44 pm

1 stop4h 44m

Lambert-St Louis

Tue 9/29

11:35 am-7:09 pm

2 stops8h 34m

$415

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 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 44m
Direct flights	None

The fastest flight from Casper to Illinois takes 4h 44m

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 July 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.