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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 9/15. 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

Frontier Logo
3:01 pm - 9:06 amMCI-STL
18h 05m1 stop
Frontier Logo
7:55 pm - 1:48 pmSTL-MCI
17h 53m1 stop
$151Frontier
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Mon, Sep 8 - Wed, Sep 10
Frontier Logo
3:01 pm - 9:06 amMCI-STL
18h 05m1 stop
Frontier Logo
7:55 pm - 1:48 pmSTL-MCI
17h 53m1 stop
$157Frontier
Find Deal
Mon, Sep 15 - Wed, Sep 17
Frontier Logo
3:01 pm - 9:06 amMCI-STL
18h 05m1 stop
Frontier Logo
7:55 pm - 1:48 pmSTL-MCI
17h 53m1 stop
$172Frontier
Find Deal
Sun, Sep 14 - Wed, Sep 17
Southwest Logo
4:45 pm - 5:50 pmMCI-STL
1h 05mnonstop
Southwest Logo
8:45 pm - 9:50 pmSTL-MCI
1h 05mnonstop
$191Southwest
Find Deal
Tue, Sep 16 - Tue, Sep 23
Southwest Logo
11:30 am - 12:35 pmMCI-STL
1h 05mnonstop
Southwest Logo
5:50 pm - 10:25 pmSTL-MCI
4h 35m1 stop
$201Southwest
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Wed, Sep 17 - Wed, Sep 24
Logo
3:01 pm - 9:06 amMCI-STL
18h 05m1 stop
Logo
10:35 am - 10:18 amSTL-MCI
23h 43m1 stop
$203
Find Deal
Fri, Sep 26 - Sun, Sep 28
Southwest Logo
4:30 pm - 10:05 pmMCI-STL
5h 35m1 stop
Southwest Logo
5:50 pm - 10:25 pmSTL-MCI
4h 35m1 stop
$211Southwest
Find Deal
Wed, Sep 17 - Wed, Sep 24
Logo
3:01 pm - 9:06 amMCI-STL
18h 05m1 stop
Logo
10:35 am - 10:18 amSTL-MCI
23h 43m1 stop
$213
Find Deal
Sun, Sep 14 - Thu, Sep 18
American Airlines Logo
1:14 pm - 8:15 pmMCI-STL
7h 01m1 stop
American Airlines Logo
5:18 am - 9:56 amSTL-MCI
4h 38m1 stop
$311American Airlines
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Tue, Sep 23 - Mon, Sep 29
American Airlines Logo
5:32 am - 11:52 amMCI-STL
6h 20m1 stop
American Airlines Logo
7:16 am - 2:13 pmSTL-MCI
6h 57m1 stop
$321American Airlines
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Tue, Sep 23 - Tue, Sep 30

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 23
MCI1:14 pmKansas City
7h 01m
1 stop
STL8:15 pmLambert-St Louis
Sep 29
STL5:18 amLambert-St Louis
4h 38m
1 stop
MCI9:56 amKansas City
$311
Find similar
American Airlines
Sep 23
MCI5:32 amKansas City
6h 20m
1 stop
STL11:52 amLambert-St Louis
Sep 30
STL7:16 amLambert-St Louis
6h 57m
1 stop
MCI2:13 pmKansas City
$321
Find similar
American Airlines
Sep 9
MCI9:37 amKansas City
5h 32m
1 stop
STL3:09 pmLambert-St Louis
Sep 16
STL7:16 amLambert-St Louis
6h 57m
1 stop
MCI2:13 pmKansas City
$382
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Southwest flights from Kansas City to St. Louis

Our best Southwest deals on Kansas City to St. Louis flight tickets
Southwest
Sep 16
MCI4:45 pmKansas City
1h 05m
STL5:50 pmLambert-St Louis
Sep 23
STL8:45 pmLambert-St Louis
1h 05m
MCI9:50 pmKansas City
$191
Find similar
Southwest
Sep 17
MCI11:30 amKansas City
1h 05m
STL12:35 pmLambert-St Louis
Sep 24
STL5:50 pmLambert-St Louis
4h 35m
1 stop
MCI10:25 pmKansas City
$201
Find similar
Southwest
Sep 17
MCI4:30 pmKansas City
5h 35m
1 stop
STL10:05 pmLambert-St Louis
Sep 24
STL5:50 pmLambert-St Louis
4h 35m
1 stop
MCI10:25 pmKansas City
$211
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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 26, 2025.
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

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Mon 9/8

3:01 pm-9:06 am

1 stop18h 05m

Lambert-St Louis

Wed 9/10

7:55 pm-1:48 pm

1 stop17h 53m

$151

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Mon 9/15

3:01 pm-9:06 am

1 stop18h 05m

Lambert-St Louis

Wed 9/17

7:55 pm-1:48 pm

1 stop17h 53m

$157

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Sun 9/14

3:01 pm-9:06 am

1 stop18h 05m

Lambert-St Louis

Wed 9/17

7:55 pm-1:48 pm

1 stop17h 53m

$172

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Tue 9/16

4:45 pm-5:50 pm

Nonstop1h 05m

Lambert-St Louis

Tue 9/23

8:45 pm-9:50 pm

Nonstop1h 05m

$191

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Wed 9/17

11:30 am-12:35 pm

Nonstop1h 05m

Lambert-St Louis

Wed 9/24

5:50 pm-10:25 pm

1 stop4h 35m

$201

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Fri 9/26

3:01 pm-9:06 am

1 stop18h 05m

Lambert-St Louis

Sun 9/28

10:35 am-10:18 am

1 stop23h 43m

$203

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Wed 9/17

4:30 pm-10:05 pm

1 stop5h 35m

Lambert-St Louis

Wed 9/24

5:50 pm-10:25 pm

1 stop4h 35m

$211

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Sun 9/14

3:01 pm-9:06 am

1 stop18h 05m

Lambert-St Louis

Thu 9/18

10:35 am-10:18 am

1 stop23h 43m

$213

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Tue 9/23

1:14 pm-8:15 pm

1 stop7h 01m

Lambert-St Louis

Mon 9/29

5:18 am-9:56 am

1 stop4h 38m

$311

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Tue 9/23

5:32 am-11:52 am

1 stop6h 20m

Lambert-St Louis

Tue 9/30

7:16 am-2:13 pm

1 stop6h 57m

$321

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, March 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 $152. The month of January is another great option to travel to St. Louis, with average flight prices from Kansas City averaging around $208.

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 $377. 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 $428. 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 $358 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 $411 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?

No. A direct flight is the cheapest option for a flight between Kansas City to St. Louis.

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

As of August 2025, prices for Kansas City to St. Louis flights are approximately 5% cheaper when compared to flights at the same time last year.

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

$183

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 $183. The best round-trip flight deal from Kansas City to St. Louis found on momondo in the last 72 hours is $256.
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 near St. Louis: 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 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 $97Free CancellationRating
8.0
4,242 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 $355, with the best Southwest deals starting from $97 round-trip. 4,242 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
Florissant
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
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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