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Cheap flights from Kansas City to St. Louis from $80

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Kansas City to St. Louis departing on 5/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Kansas City to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
5:35 pm - 6:40 pm
MCI
-
STL
1h 05mnonstop
Southwest Logo
8:25 am - 9:35 am
STL
-
MCI
1h 10mnonstop
$193Southwest
Thu, Apr 2 - Sat, Apr 4
Southwest Logo
5:35 pm - 6:40 pm
MCI
-
STL
1h 05mnonstop
Southwest Logo
3:45 pm - 10:10 pm
STL
-
MCI
6h 25m
1 stop
$203Southwest
Thu, Apr 2 - Thu, Apr 9
Southwest Logo
5:50 pm - 6:55 pm
MCI
-
STL
1h 05mnonstop
Southwest Logo
8:55 pm - 10:00 pm
STL
-
MCI
1h 05mnonstop
$205Southwest
Fri, Apr 24 - Tue, Apr 28
Southwest Logo
5:00 am - 9:35 am
MCI
-
STL
4h 35m
1 stop
Southwest Logo
5:40 am - 9:20 am
STL
-
MCI
3h 40m
1 stop
$213Southwest
Thu, Apr 2 - Thu, Apr 9
Southwest Logo
5:50 pm - 6:55 pm
MCI
-
STL
1h 05mnonstop
Southwest Logo
8:25 am - 2:10 pm
STL
-
MCI
5h 45m
1 stop
$215Southwest
Fri, Apr 24 - Tue, Apr 28
Frontier Logo
8:46 pm - 9:48 am
MCI
-
STL
13h 02m
1 stop
Frontier Logo
8:16 pm - 7:58 pm
STL
-
MCI
23h 42m
1 stop
$222Frontier
Thu, Apr 2 - Fri, Apr 3
Southwest Logo
5:35 pm - 6:40 pm
MCI
-
STL
1h 05mnonstop
Southwest Logo
4:40 pm - 11:00 pm
STL
-
MCI
6h 20m
1 stop
$223Southwest
Mon, Apr 6 - Fri, Apr 10
Southwest Logo
5:35 pm - 11:25 pm
MCI
-
STL
5h 50m
1 stop
Southwest Logo
8:25 am - 11:50 am
STL
-
MCI
3h 25m
1 stop
$225Southwest
Fri, Apr 24 - Tue, Apr 28
Frontier Logo
2:15 pm - 7:12 pm
MCI
-
STL
4h 57m
1 stop
Frontier Logo
8:12 pm - 1:30 pm
STL
-
MCI
17h 18m
1 stop
$226Frontier
Fri, May 8 - Sun, May 10
Southwest Logo
5:35 pm - 6:40 pm
MCI
-
STL
1h 05mnonstop
Southwest Logo
9:50 pm - 10:55 pm
STL
-
MCI
1h 05mnonstop
$233Southwest
Thu, Apr 2 - Thu, Apr 9

Southwest flights from Kansas City to St. Louis

Our best Southwest deals on Kansas City to St. Louis flight tickets
Southwest
Apr 2
MCI5:35 pmKansas City
1h 05m
STL6:40 pmLambert-St Louis
Apr 4
STL8:25 amLambert-St Louis
1h 10m
MCI9:35 amKansas City
$193
Southwest
Apr 2
MCI5:35 pmKansas City
1h 05m
STL6:40 pmLambert-St Louis
Apr 9
STL3:45 pmLambert-St Louis
6h 25m
1 stop
MCI10:10 pmKansas City
$203
Southwest
Apr 24
MCI5:50 pmKansas City
1h 05m
STL6:55 pmLambert-St Louis
Apr 28
STL8:55 pmLambert-St Louis
1h 05m
MCI10:00 pmKansas City
$205

United Airlines flights from Kansas City to St. Louis

Our best United Airlines deals on Kansas City to St. Louis flight tickets
United Airlines
Apr 18
MCI1:54 pmKansas City
7h 00m
1 stop
STL8:54 pmLambert-St Louis
Apr 21
STL8:30 amLambert-St Louis
11h 15m
2 stops
MCI7:45 pmKansas City
$270
United Airlines
Apr 18
MCI8:00 amKansas City
4h 22m
1 stop
STL12:22 pmLambert-St Louis
Apr 21
STL7:45 amLambert-St Louis
6h 40m
1 stop
MCI2:25 pmKansas City
$313
United Airlines
Apr 18
MCI6:00 amKansas City
7h 08m
1 stop
STL1:08 pmLambert-St Louis
Apr 21
STL8:30 amLambert-St Louis
11h 15m
2 stops
MCI7:45 pmKansas City
$318

momondo Fare Finder

 
Customize your flight search to find flights from Kansas City to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated March 10, 2026.
Use the filters below to find and compare flights from Kansas City to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 4/2

5:35 pm-6:40 pm

Nonstop1h 05m

Lambert-St Louis

Sat 4/4

8:25 am-9:35 am

Nonstop1h 10m

$193

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 4/2

5:35 pm-6:40 pm

Nonstop1h 05m

Lambert-St Louis

Thu 4/9

3:45 pm-10:10 pm

1 stop6h 25m

$203
Quickest round-trip

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Fri 4/24

5:50 pm-6:55 pm

Nonstop1h 05m

Lambert-St Louis

Tue 4/28

8:55 pm-10:00 pm

Nonstop1h 05m

$205

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 4/2

5:00 am-9:35 am

1 stop4h 35m

Lambert-St Louis

Thu 4/9

5:40 am-9:20 am

1 stop3h 40m

$213

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Fri 4/24

5:50 pm-6:55 pm

Nonstop1h 05m

Lambert-St Louis

Tue 4/28

8:25 am-2:10 pm

1 stop5h 45m

$215

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 4/2

8:46 pm-9:48 am

1 stop13h 02m

Lambert-St Louis

Fri 4/3

8:16 pm-7:58 pm

1 stop23h 42m

$222

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Mon 4/6

5:35 pm-6:40 pm

Nonstop1h 05m

Lambert-St Louis

Fri 4/10

4:40 pm-11:00 pm

1 stop6h 20m

$223

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Fri 4/24

5:35 pm-11:25 pm

1 stop5h 50m

Lambert-St Louis

Tue 4/28

8:25 am-11:50 am

1 stop3h 25m

$225

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Fri 5/8

2:15 pm-7:12 pm

1 stop4h 57m

Lambert-St Louis

Sun 5/10

8:12 pm-1:30 pm

1 stop17h 18m

$226

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 4/2

5:35 pm-6:40 pm

Nonstop1h 05m

Lambert-St Louis

Thu 4/9

9:50 pm-10:55 pm

Nonstop1h 05m

$233

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Kansas City to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to St. Louis?

In general, November is the cheapest month to fly from Kansas City to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $171. The month of May is another great option to travel to St. Louis, with average flight prices from Kansas City averaging around $258.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $379. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $432. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Kansas City in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $380 when looking at flights departing in the afternoon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $429 per ticket.

What is the cheapest Kansas City to Lambert-St Louis flight route?

Fly from Kansas City to Lambert-St Louis for the best Kansas City - Lambert-St Louis flight prices

What cabin class options are available on Kansas City to Lambert-St Louis flights?

There is only 1 cabin class available to choose from on Kansas City to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Kansas City to St. Louis flights?

You could potentially save up to 49% on your flight if you consider stops on a Kansas City to St. Louis flight.

How have Kansas City to St. Louis flight prices changed over time?

When to book flights from Kansas City to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Kansas City to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Kansas City to St. Louis (MCI to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Kansas City to St. Louis

Best Price Found

$205

Fastest flight time

1h 05m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Kansas City in the past 72 hours is $205. The best round-trip flight deal from Kansas City to St. Louis found on momondo in the last 72 hours is $383.
The fastest flight from Kansas City to St. Louis takes 1h 05m
Direct flights go from Kansas City to St. Louis every day.
There is 1 airport in St. Louis. From Kansas City there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • How far is Kansas City to Lambert-St Louis by plane?

    The straight-line distance from Kansas City to Lambert-St Louis is 237.1 mi. 1h 05m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Kansas City Airport to Lambert-St Louis Airport?

    Prices for flights from Kansas City Airport to Lambert-St Louis Airport refresh daily.

  • How many operators does momondo search for flights from Kansas City Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Kansas City Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Kansas City Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Kansas City to St. Louis?

  • What is the most popular airline from Kansas City to St. Louis?

Best airlines flying from Kansas City to St. Louis

Compare and see reviews for airlines that fly from Kansas City to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $97Free CancellationRating
8.0
4,317 reviews
Search Southwest flights

  • Southwest Flights From Kansas City to St. Louis

    Across 15 Southwest flights from Kansas City to St. Louis this week, the average price was $443, with the best Southwest deals starting from $97 round-trip. 4,317 users have rated Southwest on momondo, with an average score of 8.0/10.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Florissant
Maryland Heights
O'Fallon
Collinsville
St. Peters
Fenton
Alton
Wentzville
Farmington
Edwardsville
Festus
Clayton
Eureka
Litchfield
Glencoe
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Kansas City to St. Louis?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Kansas City to St. Louis. momondo saves you time and could save you money on your trip.

Can I find flights from Kansas City to St. Louis with flexible booking policies on momondo?

Flights from Kansas City to St. Louis with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Kansas City to St. Louis?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to St. Louis from Kansas City.

I’m not ready to book a flight from Kansas City to St. Louis right now. Can momondo alert me if prices change?

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Kansas City and alert you when they change.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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