Cheap Flights from Kansas City International to St Louis

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Compare Kansas City International to St Louis flight deals

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Flight deals from Kansas City International to St Louis

Looking for a cheap last-minute deal or the best return flight from Kansas City International to St Louis? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Kansas City International to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Kansas City International to St Louis flights are currently cheapest in July.

Direct flights from Kansas City International to St Louis

Kansas City International to St Louis: Alternative routes

Compare routes from Kansas City International to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

Kansas City to St Louis: Flight information

The things to know before you go.
Cheapest flight foundج.م.‏ 2,405
Cheapest month to flyJuly
Average flight time1 hr, 5 mins
Most popular airlineSouthwest Airlines
Average flights per week20

Finding cheap flights from Kansas City International to St Louis: Frequently asked questions

The best price we found for a return flight from Kansas City International to St Louis is ج.م.‏ 16,054. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
1 hour and 5 minutes is the average flight time from Kansas City International to St Louis.
Southwest Airlines flies direct from Kansas City International to St Louis.
As of May 2025, there are 20 flights per week flying from Kansas City International to St Louis.
The cheapest month to fly from Kansas City International to St Louis is usually May 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Kansas City International Airport to St Louis Airport on Monday, 1 December 2025.
Yes – the average flight time is 1 hour and 5 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to St Louis but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Southwest Airlines offers the cheapest flight tickets to St Louis.

Flying from Kansas City International Airport (MCI) to Lambert-St. Louis International Airport (STL): what you need to know

  • Hop on a direct flight from Kansas City International Airport to Lambert-St. Louis International Airport and you'll be in the air for an average of 1 hour 5 minutes.

  • Kansas City and St Louis follow the same timezone, UTC-5.

  • Every week, there are 16 Kansas City International Airport to Lambert-St. Louis International Airport flights. If you'd like to get going as early as possible, go for the 05:30 Southwest Airlines flight. If you're eager to make the most of your time before you fly, the last departure is at 18:50 with Southwest Airlines.

  • Leave plenty of time to catch your MCI to STL flight. As a rule of thumb, arrive two hours before international departures and an hour ahead for domestic flights.

  • Be prepared for longer queues during popular months like July. Arriving up to four hours in advance for international flights and two hours for a domestic departure is a good idea.

  • Getting to St Louis (and then exploring more of United States!) is easy with Southwest Airlines. This popular carrier offers direct flights from Kansas City International Airport to Lambert-St. Louis International Airport.

  • The airline that tops the list for bookings on this route is Southwest Airlines.

  • Southwest Airlines tops the rankings as the most punctual carrier for MCI to STL flights, with 86.59% of its services reaching their destination on schedule.

  • Think about adding a stopover when booking your ticket from Kansas City International Airport to Lambert-St. Louis International Airport. Just uncheck 'Direct flights only' to break up your journey, or maybe even explore a new city along the way. Here's where you can stop between MCI and STL:

    • Chicago Midway International Airport

    • Nashville International Airport

    • O'Hare International Airport

How to find the cheapest flights from Kansas City International Airport (MCI) to Lambert-St. Louis International Airport (STL)

  • At the moment, ج.م.‏ 2,405 is the cheapest price we've seen for a one-way Kansas City International Airport to Lambert-St. Louis International Airport flight. The best price for a return ticket is ج.م.‏ 16,054. Bear in mind that fares can change due to availability at the time of booking.

  • To score cheap tickets from MCI to STL, reserve your trip six months before your departure.

  • May is the cheapest month for flights from Kansas City International Airport to Lambert-St. Louis International Airport. If you'd like to fly during a different time of year, the 'Whole month' tool will give you the lowest prices for every month.

  • Stay on top of deals for cheap flights from MCI to STL by creating a Price Alert. You'll receive an email or notification through the app when a new discounted fare appears.

  • Find the ideal flight for you with the help of the filters. To see the 'Fastest,' 'Best' or 'Cheapest' flights from Kansas City International Airport to Lambert-St. Louis International Airport, use the 'Sort by' function. You can also filter by departure and arrival times, airline, and number of stops.

Handy information about Kansas City International Airport (MCI)

  • You'll find MCI at 601 Brasilia Avenue.

  • Kansas City International Airport gets top marks for on-time performance. 81.34% of flights that depart MCI reach their destination on time.

  • Central Kansas City to Kansas City International Airport is around 32 kilometres. Depending on traffic, it'll take you about 20 minutes to get there if you're ride-sharing, catching a cab or driving.

  • Planning to catch public transport? Expect a journey time of around 1 hour 10 minutes.

  • Taking an early flight from Kansas City International Airport to Lambert-St. Louis International Airport? Avoid the hassle of rushing to the terminal (and get some extra shut-eye) by choosing one of these hotels near MCI:

Arriving at Lambert-St. Louis International Airport (STL)

Getting from Lambert-St. Louis International Airport (STL) to central St Louis

  • You'll find STL at 10701 Lambert International Blvd..

  • Lambert-St. Louis International Airport to the centre of St Louis has a drive time of about 20 minutes. It's approximately 26 kilometres away.

  • Travelling to the centre on public transport takes roughly 35 minutes.

When to fly to Lambert-St. Louis International Airport (STL)

  • The quietest month for a flight from Kansas City International Airport to Lambert-St. Louis International Airport is April, while July is the most popular. Choose the ideal time to go to St Louis based on whether you prefer a faster pace or a more relaxed vibe.

  • When booking your flight from Kansas City International Airport to Lambert-St. Louis International Airport, think about the kind of weather you enjoy. July is the warmest month in St Louis, with temperatures ranging from 17ºC to 33ºC.

  • If you'd rather travel in cooler conditions, look for a cheap ticket from MCI to STL in January. Average temperatures are between -8ºC and 7ºC then.

Explore more of United States

  • St Louis has plenty to offer, but there are so many other corners of United States you should also see. About 418 kilometres north-east of St Louis, a trip to Chicago will fill your itinerary to the brim. Start with popular sights like Millennium Park, Art Institute of Chicago and LandShark Beer Garden at Navy Pier.

  • Indianapolis is another well-known destination in United States and is around 370 kilometres east of St Louis. No trip is complete without dropping by The Children's Museum of Indianapolis, Indianapolis Museum of Art and Indianapolis Zoo.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.