$39 Cheap Flights from Kansas City (MCI) 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 (MCI-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 4 hours ago
$97
Roundtrip
found 4 hours ago
Select Southwest Airlines flight, departing Tue, Jun 3 from Kansas City to St. Louis, returning Wed, Jun 4, priced at $97 found 4 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

Frequently asked questions

How much does a flight from Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL) cost?
Cheap round-trip flights from Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL) start at $162. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Southwest Airlines flight leaving MCI on May 14 2025 and touching down at STL. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from MCI to STL?
The cheapest flights from MCI 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 Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL)?
Board a direct flight with Southwest Airlines and travel straight from Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL).
What is the cheapest airline that flies from MCI to STL?
With tickets starting at $114 for a one-way flight from MCI to STL, Southwest Airlines is currently the cheapest carrier operating this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from MCI on June 11 2025. Prices were last updated on April 24 2025 and have not changed since.
How many flights per day from Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL)?
With an average of 2 direct flights that operate from Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL) daily, you’ll be on your way in no time.
What are the most popular departure times for flights from Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL)?
The 7 AM departures from MCI to STL are the top choice for many travelers. Greater demand means you’ll likely pay more for these departures. If you’re looking to save, choose a less crowded time to fly.
What day of the week has the most flights from MCI to STL?
Sunday offers the most flights from Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL). Consider leaving on this day and you’ll have a greater chance of finding a departure that fits your itinerary.
What is the earliest flight from Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL)?
The earliest flight departing from Kansas City Intl. Airport (MCI) is at around 6:20AM UTC-6. Board this flight and you’ll touch down at Lambert-St. Louis Intl. Airport (STL) at approximately 7:30AM UTC-6. The entire trip takes 1h 10m.
How long does it take to fly from Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL)?
It takes approximately 1 hour and 7 minutes to fly the 240 mi from MCI to STL.
What airline has the least delays from MCI to STL?
Consider traveling with Southwest Airlines if you’d like to go straight from Kansas City Intl. Airport (MCI) 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 89%. Want to be updated if anything changes? You can check your flight status using the Expedia App.
What is the best time to fly from Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL)?
To avoid possible delays on the Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL) route, aim to travel before 3 PM. Departures after this time have a 22% higher chance of being 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.
What airports do you fly into for St. Louis from Kansas City Intl. Airport (MCI)?
Lambert-St. Louis Intl. Airport (STL) is the only airport in St. Louis with direct flights from Kansas City Intl. Airport (MCI). Compare the available options and discover affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your plane ticket from MCI to STL shortly before your journey is usually more expensive. But if you’re flexible with your travel times and dates, you could land a cheap last-minute fare.
Is it cheaper to book a MCI to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking a MCI to STL flight and hotel package with Expedia could lead to significant savings. Better still, managing everything in one place takes the hassle out of travel planning. Simply pick your flights and select from our wide range of stays, then personalize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Kansas City Intl. Airport (MCI) to Lambert-St. Louis Intl. Airport (STL)?
In most cases, you’re able to reschedule or cancel your MCI to STL flight. However, additional fees may apply, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline’s fees and guidelines on flight changes, or if you’d like more information, go to our Customer Service portal.
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