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Cheap flights from Kansas City to St. Louis from $63

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 6/12. 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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0 bags

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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.
Frontier Logo
6:16 pm - 8:52 am
MCI
-
STL
14h 36m
1 stop
Frontier Logo
6:31 pm - 5:21 pm
STL
-
MCI
22h 50m
1 stop
$162Frontier
vie., jun. 19 - dom., jun. 21
Frontier Logo
1:45 pm - 7:23 pm
MCI
-
STL
5h 38m
1 stop
Frontier Logo
6:31 pm - 5:21 pm
STL
-
MCI
22h 50m
1 stop
$194Frontier
mar., jun. 9 - mar., jun. 16
Frontier Logo
6:24 pm - 8:55 am
MCI
-
STL
14h 31m
1 stop
Frontier Logo
5:06 pm - 5:21 pm
STL
-
MCI
24h 15m
1 stop
$231Frontier
vie., jun. 5 - vie., jun. 12
Frontier Logo
6:16 pm - 8:52 am
MCI
-
STL
14h 36m
1 stop
Frontier Logo
6:33 pm - 12:55 pm
STL
-
MCI
18h 22m
2 stops
$236Frontier
vie., jul. 3 - dom., jul. 5
Frontier Logo
1:45 pm - 8:47 am
MCI
-
STL
19h 02m
2 stops
Frontier Logo
6:31 pm - 5:21 pm
STL
-
MCI
22h 50m
1 stop
$239Frontier
mar., jun. 9 - mar., jun. 16
Frontier Logo
1:45 pm - 6:53 pm
MCI
-
STL
5h 08m
1 stop
Frontier Logo
2:52 pm - 12:55 pm
STL
-
MCI
22h 03m
1 stop
$240Frontier
vie., jul. 3 - dom., jul. 5
Frontier Logo
6:16 pm - 5:30 pm
MCI
-
STL
23h 14m
1 stop
Frontier Logo
6:31 pm - 5:21 pm
STL
-
MCI
22h 50m
1 stop
$252Frontier
mié., jun. 10 - jue., jun. 18
Frontier Logo
6:24 pm - 5:33 pm
MCI
-
STL
23h 09m
1 stop
Frontier Logo
5:27 pm - 5:29 pm
STL
-
MCI
24h 02m
1 stop
$257Frontier
lun., jun. 1 - vie., jun. 5
Frontier Logo
1:45 pm - 7:23 pm
MCI
-
STL
5h 38m
1 stop
Frontier Logo
8:08 pm - 12:55 pm
STL
-
MCI
16h 47m
1 stop
$260Frontier
mar., jul. 7 - lun., jul. 13
Frontier Logo
6:16 pm - 5:30 pm
MCI
-
STL
23h 14m
1 stop
Frontier Logo
5:06 pm - 12:55 pm
STL
-
MCI
43h 49m
2 stops
$277Frontier
sáb., jun. 27 - vie., jul. 3

Southwest flights from Kansas City to St. Louis

Our best Southwest deals on Kansas City to St. Louis flight tickets
Southwest
Jun 30
MCI8:30 amKansas City
1h 05m
STL9:35 amLambert-St Louis
Jun 30
STL9:25 pmLambert-St Louis
1h 05m
MCI10:30 pmKansas City
$333
Southwest
May 30
MCI6:55 amKansas City
1h 05m
STL8:00 amLambert-St Louis
Jun 1
STL9:50 pmLambert-St Louis
1h 05m
MCI10:55 pmKansas City
$337
Southwest
Jun 30
MCI8:30 amKansas City
1h 05m
STL9:35 amLambert-St Louis
Jun 30
STL2:20 pmLambert-St Louis
4h 55m
1 stop
MCI7:15 pmKansas City
$342

American Airlines flights from Kansas City to St. Louis

Our best American Airlines deals on Kansas City to St. Louis flight tickets
American Airlines
Jun 30
MCI5:31 amKansas City
7h 18m
1 stop
STL12:49 pmLambert-St Louis
Jun 30
STL5:18 pmLambert-St Louis
4h 41m
1 stop
MCI9:59 pmKansas City
$351
American Airlines
May 18
MCI6:07 pmKansas City
4h 12m
1 stop
STL10:19 pmLambert-St Louis
May 19
STL5:51 amLambert-St Louis
4h 27m
1 stop
MCI10:18 amKansas City
$632
American Airlines
May 15
MCI6:30 amKansas City
4h 57m
1 stop
STL11:27 amLambert-St Louis
May 15
STL12:27 pmLambert-St Louis
4h 59m
1 stop
MCI5:26 pmKansas City
$653

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 mayo 12, 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

vie. 6/19

6:16 pm-8:52 am

1 stop14h 36m

Lambert-St Louis

dom. 6/21

6:31 pm-5:21 pm

1 stop22h 50m

$162

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

mar. 6/9

1:45 pm-7:23 pm

1 stop5h 38m

Lambert-St Louis

mar. 6/16

6:31 pm-5:21 pm

1 stop22h 50m

$194

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

vie. 6/5

6:24 pm-8:55 am

1 stop14h 31m

Lambert-St Louis

vie. 6/12

5:06 pm-5:21 pm

1 stop24h 15m

$231

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

vie. 7/3

6:16 pm-8:52 am

1 stop14h 36m

Lambert-St Louis

dom. 7/5

6:33 pm-12:55 pm

2 stops18h 22m

$236

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

mar. 6/9

1:45 pm-8:47 am

2 stops19h 02m

Lambert-St Louis

mar. 6/16

6:31 pm-5:21 pm

1 stop22h 50m

$239

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

vie. 7/3

1:45 pm-6:53 pm

1 stop5h 08m

Lambert-St Louis

dom. 7/5

2:52 pm-12:55 pm

1 stop22h 03m

$240

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

mié. 6/10

6:16 pm-5:30 pm

1 stop23h 14m

Lambert-St Louis

jue. 6/18

6:31 pm-5:21 pm

1 stop22h 50m

$252

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

lun. 6/1

6:24 pm-5:33 pm

1 stop23h 09m

Lambert-St Louis

vie. 6/5

5:27 pm-5:29 pm

1 stop24h 02m

$257
Quickest round-trip

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

mar. 7/7

1:45 pm-7:23 pm

1 stop5h 38m

Lambert-St Louis

lun. 7/13

8:08 pm-12:55 pm

1 stop16h 47m

$260

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

sáb. 6/27

6:16 pm-5:30 pm

1 stop23h 14m

Lambert-St Louis

vie. 7/3

5:06 pm-12:55 pm

2 stops43h 49m

$277

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?

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 $266.

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 $397. 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 $459. 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 $393 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 $437 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

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

You could potentially save up to 11% 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

$213

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 $213. The best round-trip flight deal from Kansas City to St. Louis found on momondo in the last 72 hours is $395.
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

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 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 $137Free CancellationRating
8.0
4,295 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 $522, with the best Southwest deals starting from $137 round-trip. 4,295 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
Maryland Heights
O'Fallon
Florissant
St. Peters
Collinsville
Wentzville
Alton
Fenton
Farmington
Festus
Clayton
Eureka
Litchfield
Edwardsville
Shrewsbury
Grafton

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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