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Cheap flights from Illinois to Casper from $298

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 8/17. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Illinois to Casper

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
4:40 pm - 8:27 pm
STL
-
CPR
4h 47m
1 stop
United Airlines Logo
1:26 pm - 8:46 pm
CPR
-
STL
6h 20m
1 stop
$298United Airlines
Mon, Aug 17 - Sat, Aug 22
United Airlines Logo
4:40 pm - 8:27 pm
STL
-
CPR
4h 47m
1 stop
United Airlines Logo
1:26 pm - 10:00 pm
CPR
-
STL
7h 34m
2 stops
$304United Airlines
Mon, Aug 17 - Sat, Aug 22
United Airlines Logo
5:55 am - 10:49 am
ORD
-
CPR
5h 54m
1 stop
United Airlines Logo
5:15 am - 11:28 am
CPR
-
ORD
5h 13m
1 stop
$308United Airlines
Sun, Aug 23 - Sun, Aug 30
United Airlines Logo
6:00 am - 10:48 am
ORD
-
CPR
5h 48m
1 stop
United Airlines Logo
6:00 pm - 11:59 pm
CPR
-
ORD
4h 59m
1 stop
$355United Airlines
Fri, Oct 9 - Mon, Oct 12
United Airlines Logo
7:15 am - 10:53 am
ORD
-
CPR
4h 38m
1 stop
United Airlines Logo
6:01 pm - 11:57 pm
CPR
-
ORD
4h 56m
1 stop
$362United Airlines
Tue, Nov 17 - Tue, Nov 24
United Airlines Logo
6:00 am - 10:48 am
ORD
-
CPR
5h 48m
1 stop
United Airlines Logo
6:00 pm - 11:59 pm
CPR
-
ORD
4h 59m
1 stop
$376United Airlines
Fri, Oct 9 - Sun, Oct 11
United Airlines Logo
1:30 pm - 8:17 pm
STL
-
CPR
7h 47m
1 stop
United Airlines Logo
1:25 pm - 8:59 pm
CPR
-
STL
6h 34m
1 stop
$378United Airlines
Wed, Dec 9 - Sat, Dec 12
United Airlines Logo
4:30 pm - 8:17 pm
STL
-
CPR
4h 47m
1 stop
United Airlines Logo
9:10 am - 9:13 pm
CPR
-
STL
11h 03m
2 stops
$384United Airlines
Wed, Dec 9 - Sat, Dec 12
United Airlines Logo
6:00 am - 10:46 am
ORD
-
CPR
5h 46m
1 stop
United Airlines Logo
6:13 pm - 12:44 am
CPR
-
ORD
5h 31m
1 stop
$403United Airlines
Thu, Jul 23 - Sun, Jul 26
United Airlines Logo
6:00 am - 12:42 pm
ORD
-
CPR
7h 42m
1 stop
United Airlines Logo
1:23 pm - 11:19 pm
CPR
-
ORD
8h 56m
1 stop
$483United Airlines
Thu, Jul 23 - Thu, Jul 30

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United Airlines flights from Illinois to Casper

Our best United Airlines deals on Illinois to Casper flight tickets
United Airlines
Aug 17
STL4:40 pmLambert-St Louis
4h 47m
1 stop
CPR8:27 pmCasper Natrona County
Aug 22
CPR1:26 pmCasper Natrona County
6h 20m
1 stop
STL8:46 pmLambert-St Louis
$298
United Airlines
Aug 17
STL4:40 pmLambert-St Louis
4h 47m
1 stop
CPR8:27 pmCasper Natrona County
Aug 22
CPR1:26 pmCasper Natrona County
7h 34m
2 stops
STL10:00 pmLambert-St Louis
$304
United Airlines
Aug 23
ORD5:55 amChicago O'Hare Intl
5h 54m
1 stop
CPR10:49 amCasper Natrona County
Aug 30
CPR5:15 amCasper Natrona County
5h 13m
1 stop
ORD11:28 amChicago O'Hare Intl
$308

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 July 14, 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

Cheapest round-trip

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Mon 8/17

4:40 pm-8:27 pm

1 stop4h 47m

Casper Natrona County

Sat 8/22

1:26 pm-8:46 pm

1 stop6h 20m

$298

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Mon 8/17

4:40 pm-8:27 pm

1 stop4h 47m

Casper Natrona County

Sat 8/22

1:26 pm-10:00 pm

2 stops7h 34m

$304

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Sun 8/23

5:55 am-10:49 am

1 stop5h 54m

Casper Natrona County

Sun 8/30

5:15 am-11:28 am

1 stop5h 13m

$308

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Fri 10/9

6:00 am-10:48 am

1 stop5h 48m

Casper Natrona County

Mon 10/12

6:00 pm-11:59 pm

1 stop4h 59m

$355
Quickest round-trip

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Tue 11/17

7:15 am-10:53 am

1 stop4h 38m

Casper Natrona County

Tue 11/24

6:01 pm-11:57 pm

1 stop4h 56m

$362

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Fri 10/9

6:00 am-10:48 am

1 stop5h 48m

Casper Natrona County

Sun 10/11

6:00 pm-11:59 pm

1 stop4h 59m

$376

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 12/9

1:30 pm-8:17 pm

1 stop7h 47m

Casper Natrona County

Sat 12/12

1:25 pm-8:59 pm

1 stop6h 34m

$378

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 12/9

4:30 pm-8:17 pm

1 stop4h 47m

Casper Natrona County

Sat 12/12

9:10 am-9:13 pm

2 stops11h 03m

$384

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Thu 7/23

6:00 am-10:46 am

1 stop5h 46m

Casper Natrona County

Sun 7/26

6:13 pm-12:44 am

1 stop5h 31m

$403

ChicagoCasper

ORD - CPR

ORDCPR

Chicago O'Hare Intl

Thu 7/23

6:00 am-12:42 pm

1 stop7h 42m

Casper Natrona County

Thu 7/30

1:23 pm-11:19 pm

1 stop8h 56m

$483

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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See travel insights to Casper from

How to get the cheapest flight ticket from Illinois to Casper

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

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

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

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 47m

Direct flights

None
The fastest flight from Illinois to Casper takes 4h 47m
There are no direct flights from Illinois to Casper. There are no popular flight routes from Illinois to Casper.
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Frequently asked questions about flying from Illinois to Casper

  • 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 $263Free CancellationRating
7.4
9,988 reviews
Search United Airlines flights

Traveling to a place near Casper?

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

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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