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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 10/16. 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

Southwest Logo
6:15 am - 7:30 amMCI-STL
1h 15mnonstop
Southwest Logo
5:50 pm - 7:00 pmSTL-MCI
1h 10mnonstop
$97Southwest
Find Deal
Thu, Dec 4 - Sat, Dec 6
Southwest Logo
4:10 pm - 5:15 pmMCI-STL
1h 05mnonstop
Southwest Logo
8:25 am - 3:40 pmSTL-MCI
7h 15m1 stop
$107Southwest
Find Deal
Thu, Dec 4 - Sat, Dec 6
Multiple Airlines Logo
8:38 pm - 9:07 amMCI-STL
12h 29m1 stop
Multiple Airlines Logo
9:59 pm - 2:00 pmSTL-MCI
16h 01m1 stop
$208Multiple Airlines
Find Deal
Sun, Oct 12 - Mon, Oct 20
Multiple Airlines Logo
8:38 pm - 9:07 amMCI-STL
12h 29m1 stop
Multiple Airlines Logo
7:52 pm - 2:00 pmSTL-MCI
18h 08m2 stops
$240Multiple Airlines
Find Deal
Sun, Oct 12 - Mon, Oct 20
Frontier Logo
8:38 pm - 9:07 amMCI-STL
12h 29m1 stop
Frontier Logo
7:52 pm - 5:55 pmSTL-MCI
22h 03m1 stop
$258Frontier
Find Deal
Fri, Oct 10 - Fri, Oct 17
Frontier Logo
7:02 pm - 9:07 amMCI-STL
14h 05m1 stop
Frontier Logo
7:52 pm - 7:53 pmSTL-MCI
24h 01m1 stop
$268Frontier
Find Deal
Wed, Oct 8 - Thu, Oct 9
American Airlines Logo
1:30 pm - 11:54 pmMCI-STL
10h 24m1 stop
American Airlines Logo
8:42 am - 8:52 pmSTL-MCI
12h 10m1 stop
$333American Airlines
Find Deal
Wed, Oct 15 - Mon, Oct 20
American Airlines Logo
5:15 am - 10:39 amMCI-STL
5h 24m1 stop
American Airlines Logo
8:39 am - 9:23 pmSTL-MCI
12h 44m1 stop
$350American Airlines
Find Deal
Thu, Nov 6 - Mon, Nov 10
United Airlines Logo
8:00 am - 3:46 pmMCI-STL
7h 46m1 stop
United Airlines Logo
6:43 pm - 4:05 pmSTL-MCI
21h 22m2 stops
$440United Airlines
Find Deal
Thu, Nov 6 - Mon, Nov 10
United Airlines Logo
7:30 am - 3:44 pmMCI-STL
8h 14m1 stop
United Airlines Logo
12:25 pm - 11:30 pmSTL-MCI
11h 05m2 stops
$471United Airlines
Find Deal
Thu, Oct 9 - Sat, Oct 11

Frontier flights from Kansas City to St. Louis

Our best Frontier deals on Kansas City to St. Louis flight tickets
Frontier
Oct 10
MCI8:38 pmKansas City
12h 29m
1 stop
STL9:07 amLambert-St Louis
Oct 17
STL7:52 pmLambert-St Louis
22h 03m
1 stop
MCI5:55 pmKansas City
$258
Find similar
Frontier
Oct 8
MCI7:02 pmKansas City
14h 05m
1 stop
STL9:07 amLambert-St Louis
Oct 9
STL7:52 pmLambert-St Louis
24h 01m
1 stop
MCI7:53 pmKansas City
$268
Find similar
Frontier
Oct 13
MCI8:38 pmKansas City
12h 29m
1 stop
STL9:07 amLambert-St Louis
Oct 20
STL9:59 pmLambert-St Louis
43h 56m
2 stops
MCI5:55 pmKansas City
$276
Find similar

Southwest flights from Kansas City to St. Louis

Our best Southwest deals on Kansas City to St. Louis flight tickets
Southwest
Dec 4
MCI6:15 amKansas City
1h 15m
STL7:30 amLambert-St Louis
Dec 6
STL5:50 pmLambert-St Louis
1h 10m
MCI7:00 pmKansas City
$97
Find similar
Southwest
Dec 4
MCI4:10 pmKansas City
1h 05m
STL5:15 pmLambert-St Louis
Dec 6
STL8:25 amLambert-St Louis
7h 15m
1 stop
MCI3:40 pmKansas City
$107
Find similar
Southwest
Dec 4
MCI5:55 pmKansas City
4h 25m
1 stop
STL10:20 pmLambert-St Louis
Dec 6
STL5:30 amLambert-St Louis
5h 05m
1 stop
MCI10:35 amKansas City
$117
Find similar

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 September 17, 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

Thu 12/4

6:15 am-7:30 am

Nonstop1h 15m

Lambert-St Louis

Sat 12/6

5:50 pm-7:00 pm

Nonstop1h 10m

$97

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 12/4

4:10 pm-5:15 pm

Nonstop1h 05m

Lambert-St Louis

Sat 12/6

8:25 am-3:40 pm

1 stop7h 15m

$107

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Sun 10/12

8:38 pm-9:07 am

1 stop12h 29m

Lambert-St Louis

Mon 10/20

9:59 pm-2:00 pm

1 stop16h 01m

$208

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Sun 10/12

8:38 pm-9:07 am

1 stop12h 29m

Lambert-St Louis

Mon 10/20

7:52 pm-2:00 pm

2 stops18h 08m

$240

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Fri 10/10

8:38 pm-9:07 am

1 stop12h 29m

Lambert-St Louis

Fri 10/17

7:52 pm-5:55 pm

1 stop22h 03m

$258

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Wed 10/8

7:02 pm-9:07 am

1 stop14h 05m

Lambert-St Louis

Thu 10/9

7:52 pm-7:53 pm

1 stop24h 01m

$268

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Wed 10/15

1:30 pm-11:54 pm

1 stop10h 24m

Lambert-St Louis

Mon 10/20

8:42 am-8:52 pm

1 stop12h 10m

$333

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 11/6

5:15 am-10:39 am

1 stop5h 24m

Lambert-St Louis

Mon 11/10

8:39 am-9:23 pm

1 stop12h 44m

$350

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 11/6

8:00 am-3:46 pm

1 stop7h 46m

Lambert-St Louis

Mon 11/10

6:43 pm-4:05 pm

2 stops21h 22m

$440

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 10/9

7:30 am-3:44 pm

1 stop8h 14m

Lambert-St Louis

Sat 10/11

12:25 pm-11:30 pm

2 stops11h 05m

$471

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, 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 October is another great option to travel to St. Louis, with average flight prices from Kansas City averaging around $193.

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 $378. 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 Saturday because tickets tend to average around $431. 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 $337 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 $412 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 September 2025, prices for Kansas City to St. Louis flights are approximately 73% 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

$198

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 $198. The best round-trip flight deal from Kansas City to St. Louis found on momondo in the last 72 hours is $327.
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 $343, 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
Florissant
Maryland Heights
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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