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Cheap flights from Kansas City to St. Louis from $49

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 9/1. 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
0 bags

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Find the cheapest flights from Kansas City to St. Louis

Cheap round-trip flights

Southwest Logo
5:25 am - 6:30 amMCI-STL
1h 05mnonstop
Southwest Logo
2:50 pm - 3:55 pmSTL-MCI
1h 05mnonstop
$97Southwest
Find Deal
Mon, Sep 8 - Thu, Sep 11
Southwest Logo
12:00 pm - 1:05 pmMCI-STL
1h 05mnonstop
Southwest Logo
9:10 am - 2:00 pmSTL-MCI
4h 50m1 stop
$134Southwest
Find Deal
Mon, Sep 8 - Thu, Sep 11
Southwest Logo
7:15 am - 1:35 pmMCI-STL
6h 20m2 stops
Southwest Logo
9:50 am - 10:55 amSTL-MCI
1h 05mnonstop
$139Southwest
Find Deal
Mon, Sep 8 - Thu, Sep 11
Southwest Logo
12:00 pm - 1:05 pmMCI-STL
1h 05mnonstop
Southwest Logo
2:50 pm - 3:55 pmSTL-MCI
1h 05mnonstop
$155Southwest
Find Deal
Mon, Sep 22 - Fri, Sep 26
American Airlines Logo
7:00 am - 12:43 pmMCI-STL
5h 43m1 stop
American Airlines Logo
5:52 pm - 10:48 pmSTL-MCI
4h 56m1 stop
$171American Airlines
Find Deal
Tue, Aug 5 - Tue, Aug 12
American Airlines Logo
7:21 pm - 11:51 pmMCI-STL
4h 30m1 stop
American Airlines Logo
5:32 pm - 10:35 pmSTL-MCI
5h 03m1 stop
$172American Airlines
Find Deal
Thu, Aug 21 - Thu, Aug 28
Spirit Airlines Logo
4:23 pm - 10:29 amMCI-STL
18h 06m1 stop
Spirit Airlines Logo
5:26 pm - 5:09 pmSTL-MCI
23h 43m1 stop
$240Spirit Airlines
Find Deal
Tue, Jul 29 - Thu, Jul 31
United Airlines Logo
6:05 am - 10:45 pmMCI-STL
16h 40m1 stop
United Airlines Logo
8:00 am - 11:14 pmSTL-MCI
15h 14m1 stop
$298United Airlines
Find Deal
Thu, Aug 14 - Sun, Aug 17
Spirit Airlines Logo
6:00 am - 9:40 amMCI-STL
27h 40m2 stops
Spirit Airlines Logo
2:30 pm - 2:01 pmSTL-MCI
23h 31m2 stops
$300Spirit Airlines
Find Deal
Sat, Aug 16 - Sun, Aug 17
Frontier Logo
8:01 pm - 9:11 amMCI-STL
13h 10m1 stop
Frontier Logo
2:36 pm - 10:21 amSTL-MCI
19h 45m1 stop
$328Frontier
Find Deal
Fri, Jul 25 - Sun, Jul 27

Spirit Airlines flights from Kansas City to St. Louis

Our best Spirit Airlines deals on Kansas City to St. Louis flight tickets
Spirit Airlines
Jul 29
MCI4:23 pmKansas City
18h 06m
1 stop
STL10:29 amLambert-St Louis
Jul 31
STL5:26 pmLambert-St Louis
23h 43m
1 stop
MCI5:09 pmKansas City
Spirit Airlines
Aug 16
MCI6:00 amKansas City
27h 40m
2 stops
STL9:40 amLambert-St Louis
Aug 17
STL2:30 pmLambert-St Louis
23h 31m
2 stops
MCI2:01 pmKansas City
Spirit Airlines
Aug 3
MCI10:30 amKansas City
23h 22m
1 stop
STL9:52 amLambert-St Louis
Aug 10
STL5:26 pmLambert-St Louis
23h 43m
1 stop
MCI5:09 pmKansas City

Southwest flights from Kansas City to St. Louis

Our best Southwest deals on Kansas City to St. Louis flight tickets
Southwest
Sep 8
MCI5:25 amKansas City
1h 05m
STL6:30 amLambert-St Louis
Sep 11
STL2:50 pmLambert-St Louis
1h 05m
MCI3:55 pmKansas City
Southwest
Sep 8
MCI12:00 pmKansas City
1h 05m
STL1:05 pmLambert-St Louis
Sep 11
STL9:10 amLambert-St Louis
4h 50m
1 stop
MCI2:00 pmKansas City
Southwest
Sep 8
MCI7:15 amKansas City
6h 20m
2 stops
STL1:35 pmLambert-St Louis
Sep 11
STL9:50 amLambert-St Louis
1h 05m
MCI10:55 amKansas City

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, 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 Tuesday when prices can be found for as low as $382. 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 $364 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 $414 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 are 1 cabin classes 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 64% 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?

As of July 2025, prices for Kansas City to St. Louis flights are approximately 41% 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

$49

Fastest flight time

1h 00m

Direct flights

Mon, Tue, Wed, Thu, Sat and Sun

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Kansas City in the past 72 hours is $49. The best round-trip flight deal from Kansas City to St. Louis found on momondo in the last 72 hours is $97.
The fastest flight from Kansas City to St. Louis takes 1h 00m
Direct flights go from Kansas City to St. Louis on Monday, Tuesday, Wednesday, Thursday, Saturday and Sunday. The only airline offering direct flights is Southwest.
There is 1 airport near St. Louis: Lambert-St Louis (STL)

  • 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
4,253 reviews
Search Southwest flights
  • Southwest Flights From Kansas City to St. Louis

    Across 17 Southwest flights from Kansas City to St. Louis this week, the average price was $353, with the best Southwest deals starting from $97 round-trip. 4,253 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
Collinsville
Fenton
Farmington
O'Fallon
St. Peters
Alton
Wentzville
Festus
Glencoe
Clayton
Eureka
Edwardsville
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.


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Mon 7/14
Mon 7/21

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