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$39+ Cheap flights from Kansas City to St. Louis (MCI - STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
MCI — STL
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap flight deals from Kansas City to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Kansas City (MCI) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 12, 2025.

Round-trip from

$124
(Southwest)

One-way from

$39
(Southwest)

Popular in

February

Cheapest in

March

Average price

$296
From Kansas City to Lambert-St Louis
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One-way flight from Kansas City to Lambert-St Louis
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High demand for flights, 7% potential price rise
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Cheapest flight prices on average. 7% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Kansas City to St. Louis

Cheapest flights from Kansas City to St. Louis
Explore the most affordable flight options available from Kansas City to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This Southwest deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/68:35 amMCI - STL
Nonstop1h 05mSouthwest
Mon 9/89:50 amSTL - MCI
Nonstop1h 05mSouthwest
Deal found 6/12$124
This Mytrip deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1010:30 amMCI - STL
1 stop23h 22mSpirit Airlines
Thu 7/1710:47 amSTL - MCI
2 stops26h 50mSpirit Airlines
Deal found 6/12$257
This Frontier deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/111:20 amMCI - STL
1 stop26h 39mFrontier
Sun 8/32:36 pmSTL - MCI
1 stop19h 45mFrontier
Deal found 6/11$298
This Mytrip deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/411:00 amMCI - STL
2 stops7h 41mMultiple Airlines
Mon 7/77:13 pmSTL - MCI
2 stops23h 42mMultiple Airlines
Deal found 6/11$337
This American Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/207:40 pmMCI - STL
1 stop4h 14mAmerican Airlines
Tue 6/2412:28 pmSTL - MCI
1 stop6h 35mAmerican Airlines
Deal found 6/10$518
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/268:00 amMCI - STL
1 stop7h 47mUnited Airlines
Sat 8/26:33 amSTL - MCI
1 stop15h 10mUnited Airlines
Deal found 6/11$567

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
Use the filters below to find and compare flights from Kansas City to St. Louis that are best for you.

Fly from

Kansas City

Fly to

St. Louis

Route

Depart

Return

Price

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Sat 9/6

8:35 am-9:40 am

Nonstop1h 05m

Lambert-St Louis

Mon 9/8

9:50 am-10:55 am

Nonstop1h 05m

$124

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 7/10

10:30 am-9:52 am

1 stop23h 22m

Lambert-St Louis

Thu 7/17

10:47 am-1:37 pm

2 stops26h 50m

$257

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Fri 8/1

11:20 am-1:59 pm

1 stop26h 39m

Lambert-St Louis

Sun 8/3

2:36 pm-10:21 am

1 stop19h 45m

$298

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Fri 7/4

11:00 am-6:41 pm

2 stops7h 41m

Lambert-St Louis

Mon 7/7

7:13 pm-6:55 pm

2 stops23h 42m

$337

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Mon 7/21

4:59 pm-11:51 pm

1 stop6h 52m

Lambert-St Louis

Tue 7/22

5:30 am-9:53 am

1 stop4h 23m

$521

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Sat 7/26

8:00 am-3:47 pm

1 stop7h 47m

Lambert-St Louis

Sat 8/2

6:33 am-9:43 pm

1 stop15h 10m

$567

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Mon 9/15

5:30 pm-6:35 pm

Nonstop1h 05m

$49

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 9/18

5:46 am-3:25 pm

1 stop9h 39m

$103

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Sun 7/13

10:30 am-9:52 am

1 stop23h 22m

$104

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Mon 9/1

2:18 pm-9:11 am

1 stop18h 53m

$134

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 12 results
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The best insider tips for Kansas City to St. Louis flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Kansas City to St. Louis trip
Airports
MCI

MCI's central security checkpoint is efficient, rarely taking more than 5 minutes without TSA PreCheck.

Read more about MCIby Matt Meltzer
STL

Use the MetroLink light rail for a convenient, economical ride from STL to downtown St. Louis in about 40 minutes.

Read more about STLby Taryn White
Our travel experts
Matt Meltzer

Matt Meltzer

Expert on MCI

Matt Meltzer

Matt Meltzer

Matt Meltzer has been a travel writer for over a decade, covering U.S. domestic locations and hotels for Thrillist, Fifty Grande, Matador Network, Conde Nast Traveler, and other top publications. He's won multiple travel journalism awards from the Society of American Travel Writers and North American Travel Journalists Association, and currently resides in South Florida.

Read more
Taryn White

Taryn White

Expert on STL

Taryn White

Taryn White

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more

Best time to book a flight from Kansas City to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Kansas City with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Kansas City to St. Louis

What is the cheapest month to book a flight from Kansas City to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Kansas City to St. Louis (average of $311). Flying from Kansas City to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from MCI to STL?

Find hourly flight availability from Kansas City to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.

When flying from Kansas City to St. Louis, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 13% versus a flight in the morning.

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated June 12, 2025.
See what other customers who have flown with Southwest, United Airlines and American Airlines from Kansas City to St. Louis have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,287 reviews

Overall

8.0

Entertainment

7.6

Comfort

8.0

Food

7.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,287 reviews
Southwest
8.0
Very good
4,287 reviews

Overall

8.0

Entertainment

7.6

Comfort

8.0

Food

7.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
United Airlines
7.4
Good
8,790 reviews
Southwest
8.0
Very good
4,287 reviews

Overall

8.0

Entertainment

7.6

Comfort

8.0

Food

7.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,287 reviews

Overall

8.0

Entertainment

7.6

Comfort

8.0

Food

7.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Spirit Airlines
6.3
Okay
8,052 reviews
Southwest
8.0
Very good
4,287 reviews

Overall

8.0

Entertainment

7.6

Comfort

8.0

Food

7.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Frontier
6.0
Okay
3,295 reviews
Southwest
8.0
Very good
4,287 reviews

Overall

8.0

Entertainment

7.6

Comfort

8.0

Food

7.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Related info for your journey

Find useful and relevant information for your journey from Kansas City to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Kansas City to St. Louis?

    Lambert-St Louis is the airport most travelers will use when flying to St. Louis from Kansas City. Booking flights from Kansas City (MCI) to Lambert-St Louis (STL) should be relatively easy as there are 2 daily flights to St. Louis from 1 airline. 1h 00m is how long a flight from Kansas City to Lambert-St Louis will take if you book a nonstop flight.

  • How popular is this Kansas City to St. Louis flight route?

    Flights from Kansas City to Lambert-St Louis have been viewed 20 times in the past calendar month.

  • What are the cheapest airlines flying from Kansas City to St. Louis round-trip?

    Our cheapest airline available from Kansas City to St. Louis is Southwest. Our recent data shows that you can find tickets from as low as $124 on this airline. Additional options worth looking into are Spirit Airlines and Frontier, starting at $257 and $298 round-trip. You may be able to fly from Kansas City to St. Louis for 63% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Kansas City to St. Louis one-way?

    To fly one-way, consider booking your trip with Southwest, which is currently one of the cheapest options available, starting at $39. American Airlines flights start at $103 while deals on Spirit Airlines start at $104 one-way.

  • What are the cheapest flights from Kansas City to St. Louis?

    Looking at all options, your cheapest flight can be booked for $114. While the most popular route (Kansas City - Lambert-St Louis) can be booked for $97 on average our data indicates $321 when flying from Kansas City to St. Louis.

  • Can I find deals for flights from Kansas City to St. Louis that include hotel bookings?

    Yes. In addition to deals on Kansas City to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Kansas City to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Kansas City to St. Louis.

  • Can I find deals for business class flights from Kansas City to St. Louis?

    Yes. Cheapflights offers flight deals from Kansas City to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Kansas City to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Kansas City to St. Louis (average of $311). Flying from Kansas City to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Kansas City?

Book flights to Kansas City if you plan to visit one of these locations
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Festus
Alton
Farmington

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Top airline flying from Kansas City to St. Louis

Discover the top airline that operate flights from Kansas City to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$97Average$353FlexibilityNo cancel feeOn-time63%

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