Cheap Flights from Kansas City (MCI) to St. Louis (CPS)

Popular airlines from Kansas City International Airport (MCI) to St. Louis, MO (CPS-St. Louis Downtown)

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $412
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $412
Flights from Kansas City (MCI) to St. Louis (CPS)
Origin airport
Kansas City Intl.
Destination airport
St. Louis Downtown
Distance
249 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 . 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 2026. You can also book with separate airlines for your outbound and return journeys, from 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 Kansas City Intl. Airport (MCI) to St. Louis Downtown Airport (CPS) cost?
Lock in a cheap one-way flight or cheap return flight from Kansas City Intl. Airport (MCI) to St. Louis Downtown Airport (CPS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Kansas City Intl. Airport (MCI) to St. Louis Downtown Airport (CPS)?
The cheapest month to fly from MCI to CPS is , when there's less demand. Off-peak months are typically when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Kansas City Intl. Airport (MCI) to St. Louis Downtown Airport (CPS)?
Use the filters on Expedia to compare different airlines and find the most affordable carrier that'll fly you from MCI to CPS. Then, sort your results by "Price (lowest to highest)" to pick up a good deal.
How many flights per day from Kansas City Intl. Airport (MCI) to St. Louis Downtown Airport (CPS)?
You'll have to catch a flight with a layover when traveling from Kansas City Intl. Airport (MCI) to St. Louis Downtown Airport (CPS). There are no daily direct flights on this route. However, simply filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from MCI to CPS?
Typically you'll find the widest variety of flight choices on a Friday. Tuesdays are often the quietest.* But this can change based on the season, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Kansas City Intl. Airport (MCI) to St. Louis Downtown Airport (CPS)?
Choose a flight from Kansas City Intl. Airport (MCI) to St. Louis Downtown Airport (CPS) that leaves before 3 PM to reduce the risk of cancellations. Later departures 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.
What airports do you fly into for East St. Louis from Kansas City Intl. Airport (MCI)?
Lambert-St. Louis Intl. Airport (STL) is the only airport in East St. Louis with direct flights from Kansas City Intl. Airport (MCI). Consider the options and find cheap fares on Expedia.
Is it cheaper to buy a plane ticket from Kansas City Intl. Airport (MCI) to St. Louis Downtown Airport (CPS) last-minute?
Booking your plane ticket from MCI to CPS right before your journey is typically more expensive. However, if you're flexible with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a MCI to CPS flight and hotel package?
Securing a MCI to CPS flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Pick from our extensive range of hotels and then add activities, car rentals and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Kansas City Intl. Airport (MCI) to St. Louis Downtown Airport (CPS)?
It's usually possible to reschedule or cancel your MCI to CPS flight. However, if it's been more than 24 hours since booking, additional charges may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more information on our Customer Service portal.

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*Available to One Key members.