$39 Cheap Flights from Kansas City (MKC) to St. Louis (STL)

View $39 flight on Thu, May 15, 2025Opens in a new window

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Find available prices by choosing your travel dates.

Cheap Flights from Kansas City to St. Louis (MKC-STL)

Prices were available within the past 7 days and start at $39 for one-way flights and $77 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Tue, May 20 - Wed, May 21
MCI
Kansas City
STL
St. Louis
$77 Roundtrip, found 11 hours ago
$77
Roundtrip
found 11 hours ago
Select Southwest Airlines flight, departing Tue, May 20 from Kansas City to St. Louis, returning Wed, May 21, priced at $77 found 11 hours ago
Southwest Airlines
Tue, May 20 - Wed, May 21
MCI
Kansas City
STL
St. Louis
$87 Roundtrip, found 11 hours ago
$87
Roundtrip
found 11 hours ago
Select Southwest Airlines flight, departing Tue, May 20 from Kansas City to St. Louis, returning Wed, May 21, priced at $87 found 11 hours ago
Southwest Airlines
Tue, Jun 3 - Wed, Jun 4
MCI
Kansas City
STL
St. Louis
$97 Roundtrip, found 3 hours ago
$97
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Tue, Jun 3 from Kansas City to St. Louis, returning Wed, Jun 4, priced at $97 found 3 hours ago
Southwest Airlines
Tue, Jul 8 - Wed, Jul 9
MCI
Kansas City
STL
St. Louis
$102 Roundtrip, found 10 hours ago
$102
Roundtrip
found 10 hours ago
Select Southwest Airlines flight, departing Tue, Jul 8 from Kansas City to St. Louis, returning Wed, Jul 9, priced at $102 found 10 hours ago
Southwest Airlines
Tue, May 20 - Wed, May 21
MCI
Kansas City
STL
St. Louis
$107 Roundtrip, found 11 hours ago
$107
Roundtrip
found 11 hours ago
Select Southwest Airlines flight, departing Tue, May 20 from Kansas City to St. Louis, returning Wed, May 21, priced at $107 found 11 hours ago
Southwest Airlines
Tue, May 20 - Wed, May 21
MCI
Kansas City
STL
St. Louis
$114 Roundtrip, found 11 hours ago
$114
Roundtrip
found 11 hours ago
Select Southwest Airlines flight, departing Tue, May 20 from Kansas City to St. Louis, returning Wed, May 21, priced at $114 found 11 hours ago
Frontier Airlines
Thu, May 8 - Sat, May 10
MCI
Kansas City
STL
St. Louis
$181 Roundtrip, found 2 days ago
$181
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Thu, May 8 from Kansas City to St. Louis, returning Sat, May 10, priced at $181 found 2 days ago
American Airlines
Tue, May 20 - Wed, May 21
MCI
Kansas City
STL
St. Louis
$211 Roundtrip, found 11 hours ago
$211
Roundtrip
found 11 hours ago
Select American Airlines flight, departing Tue, May 20 from Kansas City to St. Louis, returning Wed, May 21, priced at $211 found 11 hours ago
United
Wed, Sep 3 - Tue, Sep 16
MCI
Kansas City
STL
St. Louis
$263 Roundtrip, found 1 day ago
$263
Roundtrip
found 1 day ago
Select United flight, departing Wed, Sep 3 from Kansas City to St. Louis, returning Tue, Sep 16, priced at $263 found 1 day ago
Delta
Sat, May 24 - Sun, May 25
MCI
Kansas City
STL
St. Louis
$378 Roundtrip, found 3 hours ago
$378
Roundtrip
found 3 hours ago
Select Delta flight, departing Sat, May 24 from Kansas City to St. Louis, returning Sun, May 25, priced at $378 found 3 hours ago
Flights from Kansas City (MCI) to St. Louis (STL)
Origin airport
Kansas City Intl.
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
$77
Distance
236 mi

Kansas City to St. Louis Flights

The cheapest times to fly from Kansas City to St. Louis

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 Kansas City to St. Louis are during the month of May. You can find some of the cheapest flights from Kansas City to St. Louis with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Kansas City to St. Louis

Sunday is one of the best days to book for cheap flights from Kansas City to St. Louis: 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 Kansas City to St. Louis

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 Kansas City to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $39 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 Kansas City to St. Louis 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 Kansas City to St. Louis 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 Charles B. Wheeler Downtown Airport (MKC) to Lambert-St. Louis Intl. Airport (STL) cost?
Discover the latest flight deals from MKC to STL by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from MKC to STL?
The cheapest flights from MKC to STL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Charles B. Wheeler Downtown Airport (MKC) to Lambert-St. Louis Intl. Airport (STL)?
Although Kansas City, MO (MKC-Charles B. Wheeler Downtown) has no direct flights to Lambert-St. Louis Intl. Airport (STL), other airports have nonstop options. Jetting off from Kansas City Intl. Airport (MCI) will get you to St. Louis without any layovers.
What is the cheapest airline that flies from MKC to STL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from MKC to STL. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Charles B. Wheeler Downtown Airport (MKC) to Lambert-St. Louis Intl. Airport (STL)?
You’ll have to take a flight with a layover if you’re traveling from Charles B. Wheeler Downtown Airport (MKC) to Lambert-St. Louis Intl. Airport (STL). Direct flights don’t operate daily on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from MKC to STL?
Usually you’ll find the largest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* But this can change depending on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What airline has the least delays from MKC to STL?
Consider traveling with Sun Country Airlines if you’d like to go straight from Charles B. Wheeler Downtown Airport (MKC) to Lambert-St. Louis Intl. Airport (STL) without any interruptions. This carrier has the best track record for punctuality, with an on-time performance of 100%. Want real-time updates? You can keep an eye on your flight status using the Expedia App.
What is the best time to fly from Charles B. Wheeler Downtown Airport (MKC) to Lambert-St. Louis Intl. Airport (STL)?
Choose a flight from Charles B. Wheeler Downtown Airport (MKC) to Lambert-St. Louis Intl. Airport (STL) that leaves before 3 PM to reduce the likelihood of delays and cancellations. Departures after this time have a 22% higher chance of being canceled, on average.**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 Charles B. Wheeler Downtown Airport (MKC) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute fares from MKC to STL are usually more expensive. To secure the lowest rates, start looking for flights early. That said, if your travel plans are flexible, it’s possible to find a cheap fare right before your journey.
Is it cheaper to book a MKC to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking a MKC to STL flight and hotel package with Expedia could result in significant savings. Better yet, having everything in one place will take the hassle out of travel planning. Simply pick your flights and choose from our extensive range of hotels, then tailor your trip with extras like car rentals and activities.
Can I cancel or change the date of my flight from Charles B. Wheeler Downtown Airport (MKC) to Lambert-St. Louis Intl. Airport (STL)?
If you booked your MKC to STL flight in the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more information.

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*Available to One Key members.