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Cheap flights from Kansas City to St. Louis from $100

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 5/27. 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

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
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
$221Frontier
Tue, Jul 14 - Tue, Jul 21
Frontier Logo
6:24 pm - 5:33 pm
MCI
-
STL
23h 09m
1 stop
Frontier Logo
4:19 pm - 5:29 pm
STL
-
MCI
25h 10m
2 stops
$243Frontier
Wed, Jun 3 - Sun, Jun 7
Frontier Logo
1:45 pm - 7:23 pm
MCI
-
STL
5h 38m
1 stop
Frontier Logo
8:08 pm - 1:00 pm
STL
-
MCI
16h 52m
1 stop
$261Frontier
Tue, Jun 16 - Wed, Jun 17
Frontier Logo
6:24 pm - 5:33 pm
MCI
-
STL
23h 09m
1 stop
Frontier Logo
6:33 pm - 5:29 pm
STL
-
MCI
22h 56m
1 stop
$263Frontier
Wed, Jun 3 - Sun, Jun 7
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
$281Frontier
Tue, Jul 21 - Wed, Jul 22
Frontier Logo
6:24 pm - 8:55 am
MCI
-
STL
14h 31m
1 stop
Frontier Logo
9:06 pm - 1:49 pm
STL
-
MCI
16h 43m
2 stops
$299Frontier
Fri, Jun 5 - Sun, Jun 7
Frontier Logo
2:34 pm - 7:23 pm
MCI
-
STL
28h 49m
1 stop
Frontier Logo
8:08 pm - 1:49 pm
STL
-
MCI
17h 41m
1 stop
$301Frontier
Fri, May 8 - Mon, May 11
Multiple Airlines Logo
6:24 pm - 8:55 am
MCI
-
STL
14h 31m
1 stop
Multiple Airlines Logo
4:19 pm - 9:29 am
STL
-
MCI
17h 10m
1 stop
$304Multiple Airlines
Fri, Jun 5 - Sun, Jun 7
Frontier Logo
1:45 pm - 7:23 pm
MCI
-
STL
5h 38m
1 stop
Frontier Logo
8:08 pm - 1:00 pm
STL
-
MCI
16h 52m
1 stop
$306Frontier
Tue, Jun 16 - Wed, Jun 17
Frontier Logo
6:24 pm - 12:21 am
MCI
-
STL
29h 57m
2 stops
Frontier Logo
8:08 pm - 1:49 pm
STL
-
MCI
17h 41m
1 stop
$307Frontier
Fri, May 8 - Mon, May 11

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Frontier flights from Kansas City to St. Louis

Our best Frontier deals on Kansas City to St. Louis flight tickets
Frontier
Jul 14
MCI1:45 pmKansas City
5h 38m
1 stop
STL7:23 pmLambert-St Louis
Jul 21
STL8:08 pmLambert-St Louis
16h 47m
1 stop
MCI12:55 pmKansas City
$221
Frontier
Jun 3
MCI6:24 pmKansas City
23h 09m
1 stop
STL5:33 pmLambert-St Louis
Jun 7
STL4:19 pmLambert-St Louis
25h 10m
2 stops
MCI5:29 pmKansas City
$243
Frontier
Jun 16
MCI1:45 pmKansas City
5h 38m
1 stop
STL7:23 pmLambert-St Louis
Jun 17
STL8:08 pmLambert-St Louis
16h 52m
1 stop
MCI1:00 pmKansas City
$261

Southwest flights from Kansas City to St. Louis

Our best Southwest deals on Kansas City to St. Louis flight tickets
Southwest
May 12
MCI4:50 pmKansas City
1h 05m
STL5:55 pmLambert-St Louis
May 15
STL9:50 pmLambert-St Louis
1h 05m
MCI10:55 pmKansas City
$335
Southwest
May 12
MCI4:25 pmKansas City
6h 45m
1 stop
STL11:10 pmLambert-St Louis
May 15
STL9:50 pmLambert-St Louis
1h 05m
MCI10:55 pmKansas City
$339
Southwest
Jul 21
MCI8:30 amKansas City
1h 05m
STL9:35 amLambert-St Louis
Jul 22
STL5:40 amLambert-St Louis
3h 40m
1 stop
MCI9:20 amKansas City
$351

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 April 28, 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
Quickest round-trip

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Tue 7/14

1:45 pm-7:23 pm

1 stop5h 38m

Lambert-St Louis

Tue 7/21

8:08 pm-12:55 pm

1 stop16h 47m

$221

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Wed 6/3

6:24 pm-5:33 pm

1 stop23h 09m

Lambert-St Louis

Sun 6/7

4:19 pm-5:29 pm

2 stops25h 10m

$243

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Tue 6/16

1:45 pm-7:23 pm

1 stop5h 38m

Lambert-St Louis

Wed 6/17

8:08 pm-1:00 pm

1 stop16h 52m

$261

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Wed 6/3

6:24 pm-5:33 pm

1 stop23h 09m

Lambert-St Louis

Sun 6/7

6:33 pm-5:29 pm

1 stop22h 56m

$263

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Tue 7/21

1:45 pm-7:23 pm

1 stop5h 38m

Lambert-St Louis

Wed 7/22

8:08 pm-12:55 pm

1 stop16h 47m

$281

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Fri 6/5

6:24 pm-8:55 am

1 stop14h 31m

Lambert-St Louis

Sun 6/7

9:06 pm-1:49 pm

2 stops16h 43m

$299

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Fri 5/8

2:34 pm-7:23 pm

1 stop28h 49m

Lambert-St Louis

Mon 5/11

8:08 pm-1:49 pm

1 stop17h 41m

$301

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Fri 6/5

6:24 pm-8:55 am

1 stop14h 31m

Lambert-St Louis

Sun 6/7

4:19 pm-9:29 am

1 stop17h 10m

$304

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Tue 6/16

1:45 pm-7:23 pm

1 stop5h 38m

Lambert-St Louis

Wed 6/17

8:08 pm-1:00 pm

1 stop16h 52m

$306

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Fri 5/8

6:24 pm-12:21 am

2 stops29h 57m

Lambert-St Louis

Mon 5/11

8:08 pm-1:49 pm

1 stop17h 41m

$307

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 $395. 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 $457. 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 $391 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 $434 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?

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?

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

$177

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 $177. The best round-trip flight deal from Kansas City to St. Louis found on momondo in the last 72 hours is $377.
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
4,314 reviews
Search Southwest flights

  • Southwest Flights From Kansas City to St. Louis

    Across 14 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. 4,314 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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