$223 Cheap Flights from St. Louis (STL) to Champaign (CMI)

View $223 flight on Sat, Oct 18, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Champaign, IL (CMI-University Of Illinois Urbana-Champaign Williard)

Cheap Flights from St. Louis to Champaign (STL-CMI)

Prices were available within the past 7 days and start at $223 for one-way flights and $406 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Nov 27 - Fri, Nov 28
STL
St. Louis
CMI
Champaign
$406 Roundtrip, found 2 days ago
$406
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Nov 27 from St. Louis to Champaign, returning Fri, Nov 28, priced at $406 found 2 days ago
American Airlines
Wed, Oct 8 - Sun, Oct 26
STL
St. Louis
CMI
Champaign
$416 Roundtrip, found 3 days ago
$416
Roundtrip
found 3 days ago
Select American Airlines flight, departing Wed, Oct 8 from St. Louis to Champaign, returning Sun, Oct 26, priced at $416 found 3 days ago
American Airlines
Wed, Sep 24 - Wed, Oct 1
STL
St. Louis
CMI
Champaign
$434 Roundtrip, found 3 days ago
$434
Roundtrip
found 3 days ago
Select American Airlines flight, departing Wed, Sep 24 from St. Louis to Champaign, returning Wed, Oct 1, priced at $434 found 3 days ago
American Airlines
Thu, Nov 27 - Fri, Nov 28
STL
St. Louis
CMI
Champaign
$446 Roundtrip, found 2 days ago
$446
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Nov 27 from St. Louis to Champaign, returning Fri, Nov 28, priced at $446 found 2 days ago
American Airlines
Wed, Oct 8 - Sun, Oct 26
STL
St. Louis
CMI
Champaign
$456 Roundtrip, found 3 days ago
$456
Roundtrip
found 3 days ago
Select American Airlines flight, departing Wed, Oct 8 from St. Louis to Champaign, returning Sun, Oct 26, priced at $456 found 3 days ago
American Airlines
Wed, Oct 22 - Sun, Nov 9
STL
St. Louis
CMI
Champaign
$459 Roundtrip, found 3 days ago
$459
Roundtrip
found 3 days ago
Select American Airlines flight, departing Wed, Oct 22 from St. Louis to Champaign, returning Sun, Nov 9, priced at $459 found 3 days ago
American Airlines
Thu, Oct 9 - Fri, Oct 10
STL
St. Louis
CMI
Champaign
$466 Roundtrip, found 23 hours ago
$466
Roundtrip
found 23 hours ago
Select American Airlines flight, departing Thu, Oct 9 from St. Louis to Champaign, returning Fri, Oct 10, priced at $466 found 23 hours ago
American Airlines
Tue, Oct 7 - Sat, Oct 11
STL
St. Louis
CMI
Champaign
$469 Roundtrip, found 23 hours ago
$469
Roundtrip
found 23 hours ago
Select American Airlines flight, departing Tue, Oct 7 from St. Louis to Champaign, returning Sat, Oct 11, priced at $469 found 23 hours ago
American Airlines
Wed, Sep 24 - Wed, Oct 1
STL
St. Louis
CMI
Champaign
$472 Roundtrip, found 3 days ago
$472
Roundtrip
found 3 days ago
Select American Airlines flight, departing Wed, Sep 24 from St. Louis to Champaign, returning Wed, Oct 1, priced at $472 found 3 days ago
American Airlines
Tue, Oct 7 - Fri, Oct 10
STL
St. Louis
CMI
Champaign
$476 Roundtrip, found 23 hours ago
$476
Roundtrip
found 23 hours ago
Select American Airlines flight, departing Tue, Oct 7 from St. Louis to Champaign, returning Fri, Oct 10, priced at $476 found 23 hours ago
Flights from St. Louis (STL) to Champaign (CMI)
Origin airport
Lambert-St. Louis Intl.
Destination airport
University Of Illinois Urbana-Champaign Williard
Airlines serving
American Airlines
Roundtrip price
$406
Distance
143 mi

St. Louis to Champaign Flights

The cheapest times to fly from St. Louis to Champaign

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Champaign are during the month of November. You can find some of the cheapest flights from St. Louis to Champaign with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Champaign

Sunday is one of the best days to book for cheap flights from St. Louis to Champaign: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Champaign

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Champaign in 2025. You can also book with separate airlines for your outbound and return journeys, from $223 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Champaign flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Champaign airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to University Of Illinois Urbana-Champaign Williard Airport (CMI) cost?
Snag a cheap one-way flight from $223 or cheap return flight from $406 from Lambert-St. Louis Intl. Airport (STL) to University Of Illinois Urbana-Champaign Williard Airport (CMI) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to University Of Illinois Urbana-Champaign Williard Airport (CMI)?
The cheapest month to fly from STL to CMI is November, when there's less demand. Off-peak season is often when better flight deals are available between these airports.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to University Of Illinois Urbana-Champaign Williard Airport (CMI)?
To find the cheapest airline that'll fly you from STL to CMI, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to University Of Illinois Urbana-Champaign Williard Airport (CMI)?
Nonstop flights from Lambert-St. Louis Intl. Airport (STL) to University Of Illinois Urbana-Champaign Williard Airport (CMI) aren't available daily, so you'll have to take a flight with a layover. Explore your options with our filter tool. Enter your travel dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to CMI?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to University Of Illinois Urbana-Champaign Williard Airport (CMI)?
Opt for a flight from Lambert-St. Louis Intl. Airport (STL) to University Of Illinois Urbana-Champaign Williard Airport (CMI) that takes off before 3 PM to reduce the likelihood of delays and cancellations. Later departures are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to University Of Illinois Urbana-Champaign Williard Airport (CMI) last-minute?
Waiting until right before your break to book a flight from STL to CMI generally means paying more. While it's possible to find some last-minute discounts, they're not always guaranteed. Be flexible with your itinerary to maximize your chances of scoring a bargain.
Is it cheaper to book a STL to CMI flight and hotel package?
Securing a STL to CMI flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Select from our extensive range of stays and then add activities, flights and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to University Of Illinois Urbana-Champaign Williard Airport (CMI)?
In most cases, you're able to cancel or reschedule your STL to CMI flight. However, additional fees may apply, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you need further information, go to our Customer Service portal.

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*Available to One Key members.