MCI - STL

$63 Find Cheap Flights from Kansas City to St. Louis - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Kansas City to St. Louis departing on 8/31. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$131
Typical prices: $431-$512
Frontier
Fri 8/28Sun 8/30
MCI - STL • 1 stop
Cheapest non-stop
$237
Typical prices: $431-$512
Southwest
Mon 8/24Mon 8/31
MCI - STL • Non-stop
Top airlines
Frontier
Cheapest • from $131 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Every day
You can fly direct with Southwest. Average duration is 1h 02m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Chicago (ORD)
Cheapest • Avg $472 (round-trip)
Minneapolis (MSP)
Shortest trip • 4h 02m (one-way)
Insights
Insights
Insights
Insights
When to travel
November
Cheapest • 66% price drop
April
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Kansas City to St. Louis (MCI-STL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Kansas City to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Kansas City to St. Louis

Fri, Aug 28 - Sun, Aug 30
Frontier Logo
11:26 am - 5:22 pm
MCI
-
STL
5h 56m
1 stop
Frontier Logo
6:17 pm - 10:41 am
STL
-
MCI
16h 24m
1 stop
$131Frontier
Fri, Aug 28 - Fri, Sep 4
Frontier Logo
11:26 am - 5:22 pm
MCI
-
STL
5h 56m
1 stop
Frontier Logo
6:17 pm - 4:05 pm
STL
-
MCI
21h 48m
1 stop
$137Frontier
Fri, Aug 28 - Fri, Sep 4
Frontier Logo
11:26 am - 5:22 pm
MCI
-
STL
5h 56m
1 stop
Frontier Logo
6:17 pm - 4:05 pm
STL
-
MCI
21h 48m
1 stop
$151Frontier
Mon, Sep 21 - Mon, Sep 28
Frontier Logo
10:30 pm - 11:32 am
MCI
-
STL
13h 02m
1 stop
Frontier Logo
12:17 pm - 9:45 pm
STL
-
MCI
9h 28m
1 stop
$158Frontier
Mon, Aug 24 - Wed, Aug 26
Frontier Logo
4:47 pm - 5:50 pm
MCI
-
STL
25h 03m
1 stop
Frontier Logo
6:45 pm - 4:02 pm
STL
-
MCI
21h 17m
1 stop
$168Frontier
Mon, Oct 5 - Thu, Oct 8
Frontier Logo
10:30 pm - 11:32 am
MCI
-
STL
13h 02m
1 stop
Frontier Logo
5:19 pm - 12:55 pm
STL
-
MCI
19h 36m
1 stop
$168Frontier
Sun, Sep 13 - Sun, Sep 20
Frontier Logo
8:32 pm - 7:17 pm
MCI
-
STL
22h 45m
1 stop
Frontier Logo
8:10 pm - 7:37 pm
STL
-
MCI
23h 27m
1 stop
$176Frontier
Sun, Sep 13 - Sun, Sep 20
Frontier Logo
8:32 pm - 7:17 pm
MCI
-
STL
22h 45m
1 stop
Frontier Logo
8:10 pm - 7:37 pm
STL
-
MCI
23h 27m
1 stop
$182Frontier
Mon, Aug 24 - Mon, Aug 31
Southwest Logo
5:00 pm - 6:05 pm
MCI
-
STL
1h 05mnonstop
Southwest Logo
2:20 pm - 3:25 pm
STL
-
MCI
1h 05mnonstop
$237Southwest
Sat, Aug 22 - Mon, Aug 24
Southwest Logo
2:25 pm - 3:25 pm
MCI
-
STL
1h 00mnonstop
Southwest Logo
8:45 pm - 9:50 pm
STL
-
MCI
1h 05mnonstop
$237Southwest
Booking Insights

KAYAK's insights & trends for Kansas City to St. Louis flights

Get data-powered insights and trends into flights from Kansas City to St. Louis to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Kansas City to St. Louis?

The average price of all round-trip flights from Kansas City to St. Louis clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to St. Louis on a Wednesday and more expensive on a Monday. On your return trip to Kansas City, you should consider flying back on a Tuesday, and avoid Mondays for better deals.

What is the cheapest month to fly from Kansas City to St. Louis?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Kansas City to St. Louis, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Kansas City to St. Louis is November, where tickets cost $171 (return) on average. On the other hand, the most expensive months are February and June, where the average cost of round-trip tickets is $765 and $691 respectively.

Can I save money by flying with a layover from Kansas City to St. Louis?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $512, prices are generally cheapest when you fly direct.

Find deals
Expert advice

Expert advice for your flight from Kansas City to St. Louis

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
John Walton

John Walton

Expert on MCI

Independent aviation journalist John Walton took his first flight at eight weeks old and hasn’t stopped travelling since. A world-renowned expert in airlines and the passenger experience, he writes in depth on aviation, is a resident expert on travel in Japan and France, and offers a uniquely queer perspective on travelling the world.

Read more
Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Read more

Good to know

Low season

December

Cheapest flight

$63
Best time to beat the crowds with an average 47% drop in price.
Most popular time to fly with an average 12% increase in price.
Flight from Kansas City to St. Louis

When to book flights from Kansas City to St. Louis

Are your dates flexible? Find out the best times to travel from Kansas City to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Kansas City to St. Louis

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

    In the last 5 days, the lowest price for a flight from Kansas City to St. Louis was $63 for a one-way ticket and $131 for a round-trip.

  • Do I need a passport to fly between Kansas City and St. Louis?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airlines offer Wi-Fi service onboard planes from Kansas City to St. Louis?

    American Airlines, Delta, Alaska Airlines, and JetBlue offer inflight Wi-Fi service on the Kansas City to St. Louis flight route.

  • Which aircraft models fly most regularly from Kansas City to St. Louis?

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Kansas City to St. Louis flight route.

  • On which days can I fly direct from Kansas City to St. Louis?

    There are nonstop flights from Kansas City to St. Louis on a daily basis.

  • How does KAYAK find such low prices on flights from Kansas City to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Kansas City to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Kansas City to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Kansas City is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Kansas City to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Kansas City with another airline. Booking your flights between Kansas City and STL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Kansas City to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Kansas City up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Kansas City to St. Louis

  • Looking for a cheap flight? 25% of our users found flights on this route for $209 or less one-way and $424 or less round-trip.

Prefer to fly direct from Kansas City to St. Louis?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Kansas City to Lambert-St Louis.
Find which airlines fly direct from Kansas City Airport to Lambert-St Louis Airport, which days they fly and book direct flights.

Direct departures

Kansas City to Lambert-St Louis

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Direct returns

Lambert-St Louis to Kansas City

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Reviews of the top airline flying from Kansas City to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Kansas City to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Kansas City to St. Louis? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4229 reviews
8.6Crew
8.0Comfort
7.5Entertainment
8.1Boarding
7.0Food
Airline reviews

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

2.0 MediocreStuart, Mar 2026
HOU - STL
Read more Southwest reviews

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

I have not flown Southwest in awhile and had a very pleasant experience. From ticketing to boarding to the flight. The flight left on time and landed ahead of schedule. It won't be so long next time!!

Everything went smoothly and we even arrived a little bit early.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

Southwest's seats are the least comfortable I have ever sat in.

For my birthday trip this was my second time ever flying, this trip was the best.

Crew was great flight was great baggage claim was a failure. It took over 1 hour for bags to arrive. Poor communication poor effort when I spoke to the supervisor about the delay

Everything was great except the food. The pretzels are really crappy.

I had a front row middle. I am not a big person and I barely fit in between that seat! No place to put my arms, even though the guys on each side were not taking over the arm rests. It felt like a frontier flight (if that tells you everything )

Overall is was a pretty good flight. However we were 15 mins late taking off and no one told us anything. We were all in our seats just sitting there for 15mins and all the sudden the pilot stayed we are leaving now. I think they should have at least said something after our take off time passed. Everyone was wondering what was going on. I will say the pilot did increase the speed of the plane so we arrived in time. So we weren't late.

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

Information on your arrival and departure airports

Kansas City (MCI)
St. Louis (STL)