CHI - STL

$49 Find Cheap Flights from Chicago to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Chicago to St. Louis departing on 4/22. 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

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Chicago to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Chicago to St. Louis, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$240
Overall average: $373
Frontier
Thu 3/12Sat 3/14
ORD - STL • 1 stop
Cheapest non-stop
$242
Typical prices: $237-$589
United Airlines
Fri 3/20Sun 3/22
ORD - STL • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Choose Basic Economy on American for carry-on only.
Midway's compact terminal eases quick departures.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Frontier
Cheapest • from $240 (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 American Airlines, Southwest and United Airlines. Average duration is 1h 21m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top routes
MDW
-
STL
Cheapest • 5% average savings
ORD
-
STL
Most popular
Insights
Insights
Insights
Insights
Avoid delays
Southwest
Most punctual • 89% on-time
Morning flights
Best time • Fewest delays
Insights
Insights
Insights
Insights
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 58% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
December
Cheapest • 35% price drop
February
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Chicago to St. Louis (CHI-STL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Chicago 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 Chicago to St. Louis

Thu, Mar 12 - Sat, Mar 14
Frontier Logo
10:53 am - 9:49 am
ORD
-
STL
22h 56m
1 stop
Frontier Logo
8:12 pm - 9:43 am
STL
-
ORD
13h 31m
1 stop
$240Frontier
Tue, Mar 10 - Wed, Mar 11
Frontier Logo
7:41 pm - 10:37 am
ORD
-
STL
14h 56m
1 stop
Frontier Logo
8:12 pm - 10:52 am
STL
-
ORD
14h 40m
2 stops
$241Frontier
Fri, Mar 20 - Sun, Mar 22
United Airlines Logo
8:12 pm - 9:42 pm
ORD
-
STL
1h 30mnonstop
United Airlines Logo
5:00 am - 6:30 am
STL
-
ORD
1h 30mnonstop
$242United Airlines
Thu, Mar 19 - Fri, Mar 20
Southwest Logo
7:45 am - 9:00 am
MDW
-
STL
1h 15mnonstop
Southwest Logo
10:15 am - 2:55 pm
STL
-
MDW
4h 40m
1 stop
$243Southwest
Sun, Mar 29 - Tue, Mar 31
American Airlines Logo
7:15 am - 8:38 am
ORD
-
STL
1h 23mnonstop
American Airlines Logo
7:05 am - 1:34 pm
STL
-
ORD
6h 29m
1 stop
$243American Airlines
Mon, Mar 23 - Mon, Mar 30
Frontier Logo
8:55 pm - 11:19 am
ORD
-
STL
14h 24m
1 stop
Frontier Logo
4:51 pm - 11:38 pm
STL
-
ORD
6h 47m
1 stop
$244Frontier
Fri, Apr 24 - Sun, Apr 26
Southwest Logo
5:00 pm - 10:40 pm
MDW
-
STL
5h 40m
1 stop
Southwest Logo
5:25 am - 6:35 am
STL
-
MDW
1h 10mnonstop
$245Southwest
Fri, Mar 13 - Sun, Mar 15
American Airlines Logo
4:40 pm - 5:53 pm
ORD
-
STL
1h 13mnonstop
American Airlines Logo
8:00 am - 9:31 am
STL
-
ORD
1h 31mnonstop
$246American Airlines
Fri, Mar 27 - Sun, Mar 29
Delta Logo
7:20 pm - 11:25 pm
MDW
-
STL
4h 05m
1 stop
Delta Logo
6:32 am - 12:29 pm
STL
-
MDW
5h 57m
1 stop
$249Delta
Fri, Mar 13 - Sun, Mar 15
Delta Logo
9:35 am - 12:58 pm
MDW
-
STL
3h 23m
1 stop
Delta Logo
6:32 am - 12:29 pm
STL
-
MDW
5h 57m
1 stop
$255Delta
Booking Insights

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

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

What is the cheapest Chicago to St. Louis flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest return flight from Chicago to St. Louis costs $218 on the route between Chicago Midway Airport (MDW) and St. Louis (STL). Over the past month, this route was, on average, 5% cheaper than other Chicago-St. Louis routes. The most popular route is between Chicago O'Hare Intl Airport (ORD) and St. Louis (STL).

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

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

If you are looking for a flight deal from Chicago to St. Louis, look for departures on Wednesdays and avoid leaving on a Tuesday, as it's usually the priciest day. When flying back from St. Louis, Friday is the cheapest day to fly and Wednesday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Chicago 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 Chicago to St. Louis is December, where tickets cost $217 (return) on average. On the other hand, the most expensive months are January and February, where the average cost of round-trip tickets is $609 and $529 respectively.

Can I save money by flying with a layover from Chicago 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.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $371 on average.

How far in advance should I book a flight from Chicago to St. Louis?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Chicago to St. Louis, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Chicago to St. Louis, you should book around 4 weeks before departure, which saves you about 58% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 12 weeks before departure.

Expert advice

Expert advice for your flight from Chicago 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
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines, ORD and MDW

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Blane Bachelor

Blane Bachelor

Expert on Southwest

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Harriet Baskas

Harriet Baskas

Expert on American Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

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.

Good to know

Low seasonDecember
Cheapest flight$49
Best time to beat the crowds with an average 36% drop in price.
Most popular time to fly with an average 57% increase in price.
Flight from Chicago Midway Airport to St. Louis

When to book flights from Chicago to St. Louis

Are your dates flexible? Find out the best times to travel from Chicago 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 Chicago to St. Louis

  • How can I fly from Chicago to STL?

    American Airlines and United Airlines have non-stop flights from ORD to STL. Southwest operates direct flights between MDW and STL. Delta, American Airlines, and United are among the airlines that fly from Chicago to STL with one stop. One-stop flights depart from both ORD and MDW, depending on the airline. Some layover cities include Charlotte (CLT), Minneapolis (MSP), Atlanta (ATL), and Denver (DEN).

  • Do the Chicago airports have a designated area for kids to play?

    ORD has a family lounge where kids can play. This lounge includes colorful seating, stroller parking, and device-charging stations. MDW does not have a family lounge, but almost all the restaurants have high chairs and kids' menus available. Also, a lot of the restaurants have huge windows looking out onto the airfield if your kids would enjoy watching the planes.

  • Do both Chicago airports have a USO?

    ORD has two USO lounges that welcome active-duty US military personnel and their families. One USO is pre-security in Terminal 2 on the Mezzanine level, and the other is post-security in Terminal 3 on the G Concourse. Both lounges are open from 9 am to 5 pm. The USO at Midway is open from 8 am to 8 pm, and is located on Concourse C, post-security.

  • How can I get from STL into downtown St Louis?

    From STL, you can take the light rail Red Line to downtown St. Louis. At STL, to catch the Metro from Terminal 1, you go to exit door 1 on the upper level. From Terminal 2, you can catch the Metro from any level of the parking garage. Go Best Express shuttles offer shared rides straight to your door in St. Louis. These shuttles depart STL every 30min from 6 am until 10 pm.

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

    In the last 3 days, the lowest price for a flight from Chicago to St. Louis was $49 for a one-way ticket and $240 for a round-trip.

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

    No, a passport isn't needed to fly from Chicago to St. Louis. However, local authorities might ask for an official ID.

  • Which airports will I be using when flying from Chicago to St. Louis?

    Chicago is served by 2 major airports and there is only 1 main airport in St. Louis. You will leave Chicago from one of these airports: Chicago Midway or Chicago O'Hare Intl. You will be arriving at Lambert-St Louis.

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

    Only American Airlines offers inflight Wi-Fi service on the Chicago to St. Louis flight route.

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

    The Canadair (Bombardier) Regional Jet CRJ-550 is the aircraft model that flies most regularly on the Chicago to St. Louis flight route.

  • Which airline alliances offer flights from Chicago to St. Louis?

    oneworld, and Star Alliance are the airline alliances operating flights between Chicago and St. Louis, with oneworld being the most commonly used for this route.

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

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

  • Which is the best airline for flights from Chicago to St. Louis, Southwest or United Airlines?

    The two airlines most popular with KAYAK users for flights from Chicago to St. Louis are Southwest and United Airlines. With an average price for the route of $314 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $473 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Chicago 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 Chicago to St. Louis.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Chicago 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 Chicago 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 Chicago with another airline.

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

  • Looking for a cheap flight? 25% of our users found flights on this route for $207 or less one-way and $361 or less round-trip.
  • The city of Chicago has two major airports. Chicago O'Hare International Airport (ORD) is a hub for American Airlines in United Airlines. Midway International Airport (MDW) is a hub for Southwest Airlines and a focus city for Frontier Airlines. The St. Louis Lambert International Airport (STL) serves as a hub for Air Choice One and Cape Air.
  • At STL, you might want to walk through Terminal 1 on the way to Baggage Claim, to enjoy the live music of the piano player. As part of an art and culture program, STL has installed a piano and hired a piano player in Terminal 1.
  • STL provides a total of six animal relief areas, four in the terminals in two outside. The ones in terminals are located at Gates A16, C24, E4, and E40. The ones outside are located in Terminal 1 just outside Exit 6 and in Terminal 2, just outside Exit 15.
  • Both CHI airports, ORD and MDW, have an airport chapel that serves as a quiet space for contemplation, prayer, and sanctuary. Worship materials, prayer books, prayer rugs, rosaries, and ablution facilities are available. The chapel in ORD is in Terminal 2 and the one in MDW is on Concourse C.
  • Both ORD and MDW provide facilities for nursing mothers. ORD has both mother's rooms and freestanding lactation suites throughout the airport, several in every terminal. MDW has a mother's room on Concourse C and a freestanding lactation suite on Concourse A.

Prefer to fly direct from Chicago to St. Louis?

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

Direct departures

Chicago to Lambert-St Louis

Monday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

Tuesday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

Wednesday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

Thursday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

Friday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

Saturday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

Sunday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

See more direct flights

Direct returns

Lambert-St Louis to Chicago

Monday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

Tuesday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

Wednesday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

Thursday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

Friday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

Saturday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

Sunday

American Airlines, Southwest, United Airlines

American Airlines, Southwest, +1 more

See more direct flights

Reviews of the top 4 airlines serving from Chicago to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Chicago 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 Chicago 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 4299 reviews
8.6Crew
7.5Entertainment
8.1Boarding
8.0Comfort
7.0Food
Airline reviews

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!!

10.0 ExcellentTy&Steph, Feb 2026
CLT - STL
Read more Southwest reviews

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!!

The Southwest experience has definitely taken a dive from its early days. You can no longer deferentiate from other airlines. Air travel is too expensive. Southwest is no longer budget friendly. They have lost me as a loyal customer.

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

An entire day of delays. Cost lots of money. Meals and a hotel.

Great plane, great attendants,great flight crew,on time. Wonderful flight home..

The WiFi and crew on the plane were good, however, the boarding experience was awful. I paid for the Choice Preferred and was boarded in group 5 so all overhead storage was full. They found room for our luggage, but further back making getting off the plane a nightmare. Also, we were in row 6 and the seats were extremely uncomfortable. Both my daughter and I had no leg room and couldn’t wait to get off the plane.

The charges were ridiculous for an hour flight and the turbulence was very scary.

Still need to work out the kinks on the new assigned seating boarding process. Otherwise, a very good flight.

WiFi did not work. Boarding with the new seating assignments took too long. The temperature in the terminal was obnoxious. +/- 80°

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

Airport terminal was outdated, flight was on a small jet with no wifi

We were delayed for about an hour from taking off due to traffic control procedures at the destination airport. But once in the air, the flight went well. The crew members were great and provided cabin service despite moderate turbulence during much of the flight.

Short flight, but no drink/snack service. The flights both going and coming were delayed.

Not being stranded in Chicago for her airport to 11:30 tomorrow morning the 3rd

I was fully checked in the prior night and i was unchecked and then didn’t have a seat when I boarded. Instead of an aisle seat, I was out in the middle seat of the very last row of the plane.

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

They lost my luggage, so, not happy. The crew was nice but my suitcases never made it, still trying to find out what happened!

I understand weather is an issue, but making us chase our plane down at five scheduled gates across three terminals in an airport the size of O'Hare was unfair. They'd have probably been better off to leave gates as TBD until the inbound plane is in final approach instead of running us all over the place. Also, props to the consistently-unprepared ground crew in Richmond for once again leaving my lane parked short of the gate because they couldn't have a crew in place on time with 2 hours notice...

cabin crew was OK, food was OK, the trip from the US to Munich was actually pretty bad comfort wise. Noisy aircraft, lights never dimmed even in Business class (night flight) barely sufficient amenities for the price. I have millions of miles with United but TBH American is gaining ground and Delta has always been marginally better then United although on paper United has more longes and cheaper upgrades.

Essy to get on. The hostess gave very little pop, the plane was late getting in, and we are still waiting for our bags. This sucks. :/

As previously stated the delay I experienced flying from Wichita to Chicago caused a host of issues. When I finally was able to be booked on the last remaining American flight from Chicago to Cincinnati, the gate changed four times with the last change occurring very near the scheduled boarding time. While I didn't have a problem moving from gate to gate, I did notice and make note of others that had mobility issues and had to move each time for the gate change.

Maintenance took a very long time and then we were in a holding pattern. While a one-off maintenance issue is standard, there were delays on both of my flights for this trip based on maintenance issues with the planes, which delayed both flights over 45 minutes. Thankfully, I didn't have any connections but it wasn't an experience that would make me pick AA if I have other options.

No Snacks or Entertainment. The flight was short, snacks should still be given.

See prior comment about how Kayak mishandled my reservation and delayed my arrival by 6 hours.

Boarding delayed 20 minutes for no reason, no wifi, in flight entertainment, or snacks / waters?

Delayed an hour due to operational issues. Minimal apologies or care for the significant inconvenience caused. Landed at nearly 1am and they still couldn’t find ground staff to get us off the plane promptly.

The aircraft had several problems - from excess fuel to non operational ac. Two hours of delay in Chicago could have been avoided with proper planning and aircraft maintenance.

This flight captain and crew were amazing, started ahead of time of departure and reached 30 mins before arrival time. Amazing!

Crew in Columbia was not prepared for landing. It was a bit of a disaster and getting bags took forever.

We were upgraded to First Class and it was a great flight

Both were great flights with wonderful pilots! It was not fancy, very simple. But boarding was super easy and the flight was smooth. Pick up in DFW was at corporate terminal which was the only confusing part for uber but if you call the uber driver and drop a pin they come right to it.

Totally great experience. Would definitely travel with them again. Thanks.

Both my fights got cancelled. Said mechanical issues but on flight tracker the flights came in and left! We were lied to!!

Was very impressed they called to confirm he would be on the flight. Great customer service!

We had a wonderful flight due to the care of our experienced pilot and copilot and the magnificent air views from our comfortable seats. What excitement to be in such a small plane with such magnificent around us.

Multiple time changes, then we left earlier than we were told.

Communication could be better but the staff and crew were over the top friendly and helpful, The flight itself was smooth.

flight was cancelled literally at 10pm the night before an early morning flight with hardly any time to reschedule. Will never book with kayak again.

My flight was cancelled 12 hours before takeoff. I was not able to reschedule another flight to make connections and had to cancel the entire trip. The ticket that was supposed to replace the cancelled flight had no boarding pass and I was unable to get one at the airport so I was denied access to the rescheduled flight. I was refunded but I missed my daughter's birthday.

I had a family emergency and couldn’t make the flight, and they wouldn’t let me cancel/refund it (a *month* ahead of time), were especially difficult with me on the phone, and wouldn’t let me even so much as reschedule the flight or get credit.

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

Information on your arrival and departure airports

Compare transportation modes for Chicago to St. Louis

Transportation modeAverage priceAverage duration
Flights$4341h 13m
Trains$745h 01m
Buses$866h 39m