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$265+ Cheap flights from Casper (CPR) to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/8. Fares are subject to change and may not be available on all flights or dates of travel.
CPR — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap flight deals from Casper to Illinois

Keep the following information in mind while searching for Casper to Illinois flight deals. Data was last updated June 12, 2025.

Round-trip from

$284
(United Airlines)

One-way from

$265
(United Airlines)
From Casper Natrona County to Illinois
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One-way flight from Casper Natrona County to Illinois
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Find flight deals from Casper to Illinois

Cheapest flights from Casper to Illinois
Explore the most affordable flight options available from Casper to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/85:59 pmCPR - ORD
1 stop5h 31mUnited Airlines
Tue 7/157:10 amORD - CPR
1 stop4h 44mUnited Airlines
Deal found 6/10$284
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/711:29 amCPR - STL
1 stop9h 21mUnited Airlines
Fri 7/118:54 amSTL - CPR
1 stop26h 05mUnited Airlines
Deal found 6/11$517

Cheapflights Fare Finder

Customize your flight search to find flights from Casper to Illinois 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, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
Use the filters below to find and compare flights from Casper to Illinois that are best for you.

Fly from

Casper

Fly to

Illinois

Route

Depart

Return

Price

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Tue 7/8

5:59 pm-12:30 am

1 stop5h 31m

Chicago O'Hare Intl

Tue 7/15

7:10 am-10:54 am

1 stop4h 44m

$284

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Mon 7/7

11:29 am-9:50 pm

1 stop9h 21m

Lambert-St Louis

Fri 7/11

8:54 am-9:59 am

1 stop26h 05m

$517

CasperChicago

CPR - ORD

CPRORD

Casper Natrona County

Tue 7/8

11:29 am-8:08 pm

1 stop7h 39m

$265

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Best time to book a flight from Casper to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Casper 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 Casper to Illinois

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated June 12, 2025.
United Airlines
7.4
Good
8,790 reviews

Entertainment

7.0

Boarding

7.7

Comfort

7.3

Food

6.6

Overall

7.4

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
United Airlines
7.4
Good
8,790 reviews
United Airlines
7.4
Good
8,790 reviews

Entertainment

7.0

Boarding

7.7

Comfort

7.3

Food

6.6

Overall

7.4

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Related info for your journey

Find useful and relevant information for your journey from Casper to Illinois. 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 from for flights from Casper to Illinois?

    Casper Natrona County (CPR), located 8.1 mi from the city center, is the airport you fly out of when you book flights from Casper to Illinois.

  • What are the most popular routes from Casper to Illinois?

    While some choose either Casper Natrona County - Lambert-St Louis or Casper Natrona County - Chicago Midway, Casper Natrona County - Chicago O'Hare Intl is the most popular route from Casper to Illinois.

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

    Yes. In addition to deals on Casper to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Casper to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Casper to Illinois.

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

    Yes. Cheapflights offers flight deals from Casper to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Casper to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Casper to Illinois (average of $245). Flying from Casper to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top airline flying from Casper to Illinois

Discover the top airline that operate flights from Casper to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$318Average$418FlexibilityNo cancel feeOn-time69%

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