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Cheap flights from Illinois to Casper from $268

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Casper departing on 4/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Illinois to Casper

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
10:49 am - 2:39 pm
ORD
-
CPR
4h 50m
1 stop
United Airlines Logo
3:14 pm - 11:28 pm
CPR
-
ORD
7h 14m
1 stop
$268United Airlines
Wed, Apr 22 - Mon, Apr 27
United Airlines Logo
1:43 pm - 5:32 pm
ORD
-
CPR
4h 49m
1 stop
United Airlines Logo
6:10 pm - 11:57 pm
CPR
-
ORD
4h 47m
1 stop
$293United Airlines
Wed, May 6 - Sun, May 10
United Airlines Logo
2:20 pm - 8:17 pm
ORD
-
CPR
6h 57m
1 stop
United Airlines Logo
3:14 pm - 9:39 pm
CPR
-
ORD
5h 25m
1 stop
$368United Airlines
Thu, May 14 - Sat, May 23
United Airlines Logo
8:40 am - 2:40 pm
ORD
-
CPR
7h 00m
1 stop
United Airlines Logo
5:25 am - 11:19 am
CPR
-
ORD
4h 54m
1 stop
$397United Airlines
Wed, Feb 25 - Sun, Mar 1
United Airlines Logo
5:45 pm - 10:07 pm
ORD
-
CPR
5h 22m
1 stop
United Airlines Logo
7:10 am - 8:16 pm
CPR
-
ORD
12h 06m
2 stops
$398United Airlines
Mon, Apr 27 - Sat, May 2
United Airlines Logo
5:50 pm - 10:09 pm
ORD
-
CPR
5h 19m
1 stop
United Airlines Logo
6:08 pm - 9:38 am
CPR
-
ORD
14h 30m
1 stop
$414United Airlines
Mon, Feb 23 - Fri, Feb 27
United Airlines Logo
5:00 am - 8:51 am
ORD
-
CPR
4h 51m
1 stop
United Airlines Logo
6:08 pm - 12:44 am
CPR
-
ORD
5h 36m
1 stop
$420United Airlines
Fri, Jul 3 - Fri, Jul 10
United Airlines Logo
7:55 pm - 10:48 am
ORD
-
CPR
15h 53m
2 stops
United Airlines Logo
6:10 pm - 11:57 pm
CPR
-
ORD
4h 47m
1 stop
$433United Airlines
Wed, May 6 - Sun, May 10
United Airlines Logo
12:50 pm - 7:02 pm
ORD
-
CPR
7h 12m
1 stop
United Airlines Logo
6:08 pm - 2:47 pm
CPR
-
ORD
19h 39m
2 stops
$462United Airlines
Wed, Feb 25 - Sun, Mar 1
United Airlines Logo
1:38 pm - 8:20 pm
STL
-
CPR
7h 42m
1 stop
United Airlines Logo
11:19 am - 8:42 pm
CPR
-
STL
8h 23m
1 stop
$533United Airlines
Fri, Jun 12 - Sun, Jun 14

United Airlines flights from Illinois to Casper

Our best United Airlines deals on Illinois to Casper flight tickets
United Airlines
Apr 22
ORD10:49 amChicago O'Hare Intl
4h 50m
1 stop
CPR2:39 pmCasper Natrona County
Apr 27
CPR3:14 pmCasper Natrona County
7h 14m
1 stop
ORD11:28 pmChicago O'Hare Intl
$268
United Airlines
May 14
ORD2:20 pmChicago O'Hare Intl
6h 57m
1 stop
CPR8:17 pmCasper Natrona County
May 23
CPR3:14 pmCasper Natrona County
5h 25m
1 stop
ORD9:39 pmChicago O'Hare Intl
$368
United Airlines
Feb 25
ORD8:40 amChicago O'Hare Intl
7h 00m
1 stop
CPR2:40 pmCasper Natrona County
Mar 1
CPR5:25 amCasper Natrona County
4h 54m
1 stop
ORD11:19 amChicago O'Hare Intl
$397

momondo 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, momondo users made 832,500 searches. Data last updated February 11, 2026.
Use the filters below to find and compare flights from Illinois to Casper that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Wed 4/22

10:49 am-2:39 pm

1 stop4h 50m

Casper Natrona County

Mon 4/27

3:14 pm-11:28 pm

1 stop7h 14m

$268

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Wed 5/6

1:43 pm-5:32 pm

1 stop4h 49m

Casper Natrona County

Sun 5/10

6:10 pm-11:57 pm

1 stop4h 47m

$293

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Thu 5/14

2:20 pm-8:17 pm

1 stop6h 57m

Casper Natrona County

Sat 5/23

3:14 pm-9:39 pm

1 stop5h 25m

$368

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Wed 2/25

8:40 am-2:40 pm

1 stop7h 00m

Casper Natrona County

Sun 3/1

5:25 am-11:19 am

1 stop4h 54m

$397

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Mon 4/27

5:45 pm-10:07 pm

1 stop5h 22m

Casper Natrona County

Sat 5/2

7:10 am-8:16 pm

2 stops12h 06m

$398

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Mon 2/23

5:50 pm-10:09 pm

1 stop5h 19m

Casper Natrona County

Fri 2/27

6:08 pm-9:38 am

1 stop14h 30m

$414

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Fri 7/3

5:00 am-8:51 am

1 stop4h 51m

Casper Natrona County

Fri 7/10

6:08 pm-12:44 am

1 stop5h 36m

$420

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Wed 5/6

7:55 pm-10:48 am

2 stops15h 53m

Casper Natrona County

Sun 5/10

6:10 pm-11:57 pm

1 stop4h 47m

$433

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Wed 2/25

12:50 pm-7:02 pm

1 stop7h 12m

Casper Natrona County

Sun 3/1

6:08 pm-2:47 pm

2 stops19h 39m

$462

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Fri 6/12

1:38 pm-8:20 pm

1 stop7h 42m

Casper Natrona County

Sun 6/14

11:19 am-8:42 pm

1 stop8h 23m

$533

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Cheap Illinois to Casper flight deals and tips

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

Fastest flight time

4h 50m

Direct flights

None
The fastest flight from Illinois to Casper takes 4h 50m
There are no direct flights from Illinois to Casper. There are no popular flight routes from Illinois to Casper.
Search flight deals

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

    Prices for flights from Illinois to Casper Natrona County Airport are refreshed on a daily basis.

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Illinois to Casper Natrona County Airport.

  • What documentation or ID do you need to fly to Casper Natrona County Airport?

    The travel and health documents you'll need for your trip to Casper Natrona County Airport 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 Casper Natrona County Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Illinois to Casper

Compare and see reviews for airlines that fly from Illinois to Casper with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $248Free CancellationRating
7.4
9,269 reviews
Search United Airlines flights

  • How do I get Price Alerts for flights from Illinois to Casper?

    Price Alerts will notify you by email when the price for flights to Casper from Illinois decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

  • How can I save money on flights from Illinois to Casper with momondo?

    Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

  • How does momondo find its flight prices?

    momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

Traveling to a place near Casper?

Book flights to Casper if you plan to visit one of these locations
Rawlins
Evansville
Douglas

Why use momondo?

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

It is quick and easy to find Illinois to Casper flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Casper that suits you.

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

momondo does allow users to show only those flights to Casper from Illinois which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search for Illinois to Casper flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are not ready to book a flight from Illinois to Casper now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Casper and let you know when they change.

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