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Cheap flights from Kansas City to St. Louis from $72

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 9/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Kansas City to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
10:30 pm - 11:17 amMCI  Kansas City-STL Lambert-St Louis
12h 47m1 stop Las Vegas Harry Reid Intl
Frontier Logo
12:17 pm - 9:45 pmSTL  Lambert-St Louis-MCI Kansas City
9h 28m1 stop Las Vegas Harry Reid Intl
$192Frontier
Thu, Sep 10 - Mon, Sep 14
Frontier Logo
10:30 pm - 11:32 amMCI  Kansas City-STL Lambert-St Louis
13h 02m1 stop Las Vegas Harry Reid Intl
Frontier Logo
8:10 pm - 7:37 pmSTL  Lambert-St Louis-MCI Kansas City
23h 27m1 stop Denver Intl
$202Frontier
Mon, Sep 28 - Wed, Sep 30
Frontier Logo
10:30 pm - 11:32 amMCI  Kansas City-STL Lambert-St Louis
13h 02m1 stop Las Vegas Harry Reid Intl
Frontier Logo
12:17 pm - 9:45 pmSTL  Lambert-St Louis-MCI Kansas City
9h 28m1 stop Las Vegas Harry Reid Intl
$215Frontier
Fri, Sep 25 - Mon, Sep 28
Multiple Airlines Logo
8:32 pm - 7:17 pmMCI  Kansas City-STL Lambert-St Louis
22h 45m1 stop Denver Intl
Multiple Airlines Logo
10:35 am - 8:26 amSTL  Lambert-St Louis-MCI Kansas City
21h 51m2 stops Atlanta Hartsfield-Jackson Fort Lauderdale
$222Multiple Airlines
Thu, Oct 1 - Thu, Oct 8
Frontier Logo
11:26 am - 5:22 pmMCI  Kansas City-STL Lambert-St Louis
5h 56m1 stop Atlanta Hartsfield-Jackson
Frontier Logo
6:17 pm - 10:41 amSTL  Lambert-St Louis-MCI Kansas City
16h 24m1 stop Atlanta Hartsfield-Jackson
$223Frontier
Fri, Sep 4 - Sun, Sep 6
Frontier Logo
2:17 pm - 7:15 pmMCI  Kansas City-STL Lambert-St Louis
4h 58m1 stop Denver Intl
Frontier Logo
5:32 pm - 12:55 pmSTL  Lambert-St Louis-MCI Kansas City
19h 23m1 stop Las Vegas Harry Reid Intl
$225Frontier
Fri, Oct 30 - Sat, Nov 14
Frontier Logo
10:30 pm - 11:17 amMCI  Kansas City-STL Lambert-St Louis
12h 47m1 stop Las Vegas Harry Reid Intl
Frontier Logo
12:27 pm - 9:45 pmSTL  Lambert-St Louis-MCI Kansas City
9h 18m1 stop Las Vegas Harry Reid Intl
$226Frontier
Thu, Sep 10 - Sun, Sep 13
Frontier Logo
10:30 pm - 11:32 amMCI  Kansas City-STL Lambert-St Louis
13h 02m1 stop Las Vegas Harry Reid Intl
Frontier Logo
8:10 pm - 1:22 pmSTL  Lambert-St Louis-MCI Kansas City
17h 12m1 stop Denver Intl
$236Frontier
Mon, Oct 5 - Fri, Oct 9
Southwest Logo
2:25 pm - 3:25 pmMCI  Kansas City-STL Lambert-St Louis
1h 00mnonstop
Southwest Logo
11:40 am - 12:45 pmSTL  Lambert-St Louis-MCI Kansas City
1h 05mnonstop
$237Southwest
Sat, Sep 5 - Sun, Sep 6
Southwest Logo
8:15 am - 9:20 amMCI  Kansas City-STL Lambert-St Louis
1h 05mnonstop
Southwest Logo
3:30 pm - 9:55 pmSTL  Lambert-St Louis-MCI Kansas City
6h 25m1 stop Washington, D.C. Reagan-National
$247Southwest
Sat, Sep 5 - Sun, Sep 6

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American Airlines flights from Kansas City to St. Louis

Our best American Airlines deals on Kansas City to St. Louis flight tickets
American Airlines
Sep 5
MCI7:39 pmKansas City
4h 19m
1 stop
STL11:58 pmLambert-St Louis
Sep 6
STL8:07 pmLambert-St Louis
4h 28m
1 stop
MCI12:35 amKansas City
$258
American Airlines
Aug 19
MCI7:39 pmKansas City
4h 35m
1 stop
STL12:14 amLambert-St Louis
Aug 26
STL8:07 pmLambert-St Louis
4h 28m
1 stop
MCI12:35 amKansas City
$391
American Airlines
Aug 10
MCI7:39 pmKansas City
4h 35m
1 stop
STL12:14 amLambert-St Louis
Aug 17
STL8:07 pmLambert-St Louis
4h 28m
1 stop
MCI12:35 amKansas City
$411

Southwest flights from Kansas City to St. Louis

Our best Southwest deals on Kansas City to St. Louis flight tickets
Southwest
Sep 5
MCI2:25 pmKansas City
1h 00m
STL3:25 pmLambert-St Louis
Sep 6
STL11:40 amLambert-St Louis
1h 05m
MCI12:45 pmKansas City
$237
Southwest
Sep 5
MCI8:15 amKansas City
1h 05m
STL9:20 amLambert-St Louis
Sep 6
STL3:30 pmLambert-St Louis
6h 25m
1 stop
MCI9:55 pmKansas City
$247
Southwest
Oct 30
MCI1:50 pmKansas City
1h 05m
STL2:55 pmLambert-St Louis
Nov 14
STL5:05 pmLambert-St Louis
1h 10m
MCI6:15 pmKansas City
$254

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 August 9, 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 Kansas City - STL Lambert-St Louis

MCISTL

Kansas City

Thu 9/10

10:30 pm-11:17 am

1 stop12h 47m

Lambert-St Louis

Mon 9/14

12:17 pm-9:45 pm

1 stop9h 28m

$192

Kansas CitySt. Louis

MCI Kansas City - STL Lambert-St Louis

MCISTL

Kansas City

Mon 9/28

10:30 pm-11:32 am

1 stop13h 02m

Lambert-St Louis

Wed 9/30

8:10 pm-7:37 pm

1 stop23h 27m

$202

Kansas CitySt. Louis

MCI Kansas City - STL Lambert-St Louis

MCISTL

Kansas City

Fri 9/25

10:30 pm-11:32 am

1 stop13h 02m

Lambert-St Louis

Mon 9/28

12:17 pm-9:45 pm

1 stop9h 28m

$215

Kansas CitySt. Louis

MCI Kansas City - STL Lambert-St Louis

MCISTL

Kansas City

Thu 10/1

8:32 pm-7:17 pm

1 stop22h 45m

Lambert-St Louis

Thu 10/8

10:35 am-8:26 am

2 stops21h 51m

$222

Kansas CitySt. Louis

MCI Kansas City - STL Lambert-St Louis

MCISTL

Kansas City

Fri 9/4

11:26 am-5:22 pm

1 stop5h 56m

Lambert-St Louis

Sun 9/6

6:17 pm-10:41 am

1 stop16h 24m

$223

Kansas CitySt. Louis

MCI Kansas City - STL Lambert-St Louis

MCISTL

Kansas City

Fri 10/30

2:17 pm-7:15 pm

1 stop4h 58m

Lambert-St Louis

Sat 11/14

5:32 pm-12:55 pm

1 stop19h 23m

$225

Kansas CitySt. Louis

MCI Kansas City - STL Lambert-St Louis

MCISTL

Kansas City

Thu 9/10

10:30 pm-11:17 am

1 stop12h 47m

Lambert-St Louis

Sun 9/13

12:27 pm-9:45 pm

1 stop9h 18m

$226

Kansas CitySt. Louis

MCI Kansas City - STL Lambert-St Louis

MCISTL

Kansas City

Mon 10/5

10:30 pm-11:32 am

1 stop13h 02m

Lambert-St Louis

Fri 10/9

8:10 pm-1:22 pm

1 stop17h 12m

$236
Quickest round-trip

Kansas CitySt. Louis

MCI Kansas City - STL Lambert-St Louis

MCISTL

Kansas City

Sat 9/5

2:25 pm-3:25 pm

Nonstop1h 00m

Lambert-St Louis

Sun 9/6

11:40 am-12:45 pm

Nonstop1h 05m

$237

Kansas CitySt. Louis

MCI Kansas City - STL Lambert-St Louis

MCISTL

Kansas City

Sat 9/5

8:15 am-9:20 am

Nonstop1h 05m

Lambert-St Louis

Sun 9/6

3:30 pm-9:55 pm

1 stop6h 25m

$247

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 typical price of a round-trip flight between Kansas City and St. Louis?

Prices are currently low for flights on this route.

Typical prices usually range from $431 to $512.
The lowest price recently found on this route was $192.

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 December is another great option to travel to St. Louis, with average flight prices from Kansas City averaging around $271.

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 Wednesday when prices can be found for as low as $420. 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 Monday because tickets tend to average around $464. 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 at noon is the least expensive time of day to depart. momondo users have found prices as low as $421 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $454 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 St. Louis flights?

There is only 1 cabin class available to choose from on Kansas City to 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 52% 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

$209

Fastest flight time

1h 00m

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 $209. The best round-trip flight deal from Kansas City to St. Louis found on momondo in the last 72 hours is $364.
The fastest flight from Kansas City to St. Louis takes 1h 00m
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

Frequently asked questions about flying from Kansas City to St. Louis

  • 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 00m 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 $144Free CancellationRating
8.0
4,216 reviews
Search Southwest flights

  • Southwest Flights From Kansas City to St. Louis

    Across 12 Southwest flights from Kansas City to St. Louis this week, the average price was $516, with the best Southwest deals starting from $144 round-trip. 4,216 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
Fairview Heights
Hermann
St. Peters
Maryland Heights
Florissant
Collinsville
Alton
O'Fallon
Clayton
Farmington
Fenton
Wentzville
Festus
Eureka
Edwardsville
Litchfield
Grafton
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.
Start using Trips
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