ORD - STL

$46 Find Cheap Flights from Chicago O'Hare Airport 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 O'Hare Intl to St. Louis departing on 8/20. 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

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

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flights Deals
Expert advice
Booking Insights
Flights Deals

Cheap Flights from O'Hare Intl to St. Louis (ORD-STL)

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

Wed, Aug 27 - Wed, Sep 3
United Airlines Logo
1:05 pm - 2:33 pmORD-STL
1h 28mnonstop
United Airlines Logo
6:35 am - 8:05 amSTL-ORD
1h 30mnonstop
$91United Airlines
Find Deal
Sat, Sep 13 - Sat, Sep 20
American Airlines Logo
8:31 pm - 9:53 pmORD-STL
1h 22mnonstop
American Airlines Logo
6:10 am - 7:30 amSTL-ORD
1h 20mnonstop
$92American Airlines
Find Deal
Wed, Sep 17 - Sat, Sep 20
United Airlines Logo
2:20 pm - 3:44 pmORD-STL
1h 24mnonstop
United Airlines Logo
3:20 pm - 4:45 pmSTL-ORD
1h 25mnonstop
$119United Airlines
Find Deal
Sat, Aug 23 - Sun, Aug 24
American Airlines Logo
6:00 pm - 7:21 pmORD-STL
1h 21mnonstop
American Airlines Logo
7:23 am - 8:48 amSTL-ORD
1h 25mnonstop
$120American Airlines
Find Deal
Wed, Aug 27 - Wed, Sep 3
Southwest Logo
3:10 pm - 8:05 pmORD-STL
4h 55m1 stop
Southwest Logo
6:25 am - 12:45 pmSTL-ORD
6h 20m1 stop
$141Southwest
Find Deal
Fri, Sep 12 - Fri, Sep 19
Southern / Mokulele Logo
8:15 am - 12:00 pmORD-STL
3h 45m1 stop
Southern / Mokulele Logo
9:20 am - 4:19 pmSTL-ORD
6h 59m1 stop
$167Southern / Mokulele
Find Deal
Sat, Aug 23 - Sun, Aug 24
Southern / Mokulele Logo
1:10 pm - 12:10 pmORD-STL
23h 00m1 stop
Southern / Mokulele Logo
5:15 pm - 7:37 amSTL-ORD
14h 22m1 stop
$168Southern / Mokulele
Find Deal
Sat, Aug 30 - Sat, Sep 6
Southwest Logo
2:55 pm - 8:30 pmORD-STL
5h 35m1 stop
Southwest Logo
6:35 am - 12:45 pmSTL-ORD
6h 10m1 stop
$171Southwest
Find Deal
Tue, Aug 19 - Thu, Aug 21
Delta Logo
9:47 am - 2:41 pmORD-STL
4h 54m1 stop
Delta Logo
5:11 pm - 11:56 pmSTL-ORD
6h 45m1 stop
$177Delta
Find Deal
Sat, Aug 23 - Sun, Aug 24
Delta Logo
2:25 pm - 11:24 pmORD-STL
8h 59m2 stops
Delta Logo
5:11 pm - 11:56 pmSTL-ORD
6h 45m1 stop
$182Delta
Find Deal
Expert advice

Expert advice for your flight from O'Hare Intl to St. Louis

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-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.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
American Airlines

Basic Economy fares offer low prices but come with restrictions like late boarding and no seat assignment.


Main Cabin Extra offers early boarding and complimentary drinks, enhancing comfort for a small fee.

United Airlines

United First provides ample legroom, up to seven inches more than economy, ideal for comfort.


Economy Plus offers extra legroom and is located in the front rows of the economy cabin.

Airports
ORD

At O'Hare, security lines can exceed 30 minutes during peak times. Arrive early to avoid delays, especially for morning and afternoon flights.

Read more about ORDby Stefanie Waldek
STL

Use MetroLink for a convenient ride from STL to downtown St. Louis, avoiding rush hour traffic. The Red Line connects directly to key city areas.

Read more about STLby Yulia Denisyuk
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on American Airlines

Harriet Baskas

Harriet Baskas

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.

Read more
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and ORD

Stefanie Waldek

Stefanie Waldek

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.

Read more
Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia Denisyuk

Yulia Denisyuk

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
Booking Insights

KAYAK's insights & trends for O'Hare Intl to St. Louis flights

Get data-powered insights and trends into flights from O'Hare Intl 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 Chicago O'Hare Airport to St. Louis?

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

When flying from Chicago O'Hare Airport to St. Louis, you should consider leaving on a Friday and avoid Mondays if you are looking for the best rates. For your return to Chicago O'Hare Airport, you’ll find the best rates on Thursdays and the most expensive ones on Mondays.

What is the cheapest month to fly from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport 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 O'Hare Intl Airport to St. Louis is September, where tickets cost $212 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $308 and $303 respectively.

Can I save money by flying with a layover from Chicago O'Hare Intl Airport 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 $341 on average.

How far in advance should I book a flight from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport 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 O'Hare Intl Airport 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.

Good to know

Low seasonJanuary
Cheapest flight$46
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly and prices are also 22% lower on average.
Flight from Chicago O'Hare Airport to St. Louis

When to book flights from O'Hare Intl to St. Louis

Are your dates flexible? Find out the best times to travel from O'Hare Intl 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 Chicago O'Hare Airport to St. Louis flights

  • How can I travel sustainably from Chicago O'Hare International Airport to St. Louis?

    If you want to travel in an eco-friendly way, consider booking your flight with carriers serious about flight sustainability. Delta is vocal about its sustainability pledge to reduce its carbon emissions significantly. The airline is investing in offsetting its carbon, implementing clean air technology, and eliminating single-use plastic items. Keeping sustainable fleets is among its commendable initiatives.

  • How can I catch the first flight from Chicago O'Hare International Airport to St. Louis?

    The most convenient and sustainable way to catch your early morning flight, especially if you live far from ORD, is by booking a nearby hotel. Commuting in the morning amid traffic snarl-ups is worth avoiding. O’Hare Inn & Suites, Red Roof Inn Chicago, and Wyndham Chicago O’Hare offer great airport accessibility.

  • Do flights from Chicago O'Hare International Airport to St. Louis consider persons with limited mobility?

    Passengers with limited mobility are considered on this route. For instance, if you book your ticket with Spirit Airlines, remember to make a special arrangement request. The carrier is dedicated to providing accessible, seamless, and comfortable air trips to all its travelers, regardless of their circumstances. The airline has a competent staff to offer meet-and-assist services, wheelchair support, and in-flight services.

  • What are the best transportation options from Lambert-St Louis Airport to the city center?

    Multiple options exist when connecting from Lambert-St Louis (STL) to the city center. A train operates the route from the airport to Stadium Metrolink Station, taking about 35 minutes. Line Bus also operates the route, arriving downtown St. Louis in about 1 hour and 15 minutes. Taxis take about 20 minutes to arrive at the city center.

  • What is the cheapest flight from Chicago O'Hare Intl Airport to St. Louis?

    In the last 3 days, the lowest price for a flight from Chicago O'Hare Intl Airport to St. Louis was $46 for a one-way ticket and $91 for a round-trip.

  • Do I need a passport to fly between Chicago O'Hare Airport 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 Chicago O'Hare Airport to St. Louis?

    American Airlines, Alaska Airlines, JetBlue, and Delta offer inflight Wi-Fi service on the Chicago O'Hare Airport to St. Louis flight route.

  • Which aircraft models fly most regularly from Chicago O'Hare Airport to St. Louis?

    The Boeing 737-800 is the aircraft model that flies most regularly on the Chicago O'Hare Airport to St. Louis flight route.

  • Which airline alliances offer flights from Chicago O'Hare Airport to St. Louis?

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

  • On which days can I fly direct from Chicago O'Hare Airport to St. Louis?

    There are nonstop flights from Chicago O'Hare Airport to St. Louis on a daily basis.

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

    The two airlines most popular with KAYAK users for flights from Chicago to St. Louis are United Airlines and American Airlines. With an average price for the route of $322 and an overall rating of 7.4, United Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $283 and an overall rating of 7.2.

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

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Chicago O'Hare Airport 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 O'Hare Airport 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 O'Hare Airport 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 O'Hare Airport with another airline. Booking your flights between Chicago O'Hare Airport 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 Chicago O'Hare Airport 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 O'Hare Airport 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 O'Hare Intl Airport to St. Louis

  • Looking for a cheap flight? 25% of our users found flights on this route for $133 or less one-way and $151 or less round-trip.
  • Chicago O'Hare International Airport (ORD) is a central hub for air travel, and your flight will fly into Lambert-St. Louis Airport (STL). The airlines to expect on the route include Delta, Spirit Airlines, United Airlines, American Airlines, and Southern/Mokulele. These airlines operate various flight options.
  • When traveling from Chicago O'Hare International Airport (ORD) to St. Louis, the most popular locations for stopover flights include Quincy, Burlington, Detroit, Minneapolis, and Charlotte. The layover cities on this route vary depending on your airline and specific flight schedules.
  • Multiple airlines from Chicago O'Hare International Airport (ORD) to St Louis offer Business Class flights with common amenities and services, including comfortable seating, unlimited in-flight entertainment, improved dining options, access to selected lounges, and extra legroom.
  • Since STL is a hub for American Airlines, consider traveling with the airline to enjoy unlimited lounge amenities when you land. American Airlines Admirals Club treats its Business Class and First Class passengers to unlimited entertainment, shower options, complimentary snacks, food, and drinks. Digital magazines and business centers are also available at your convenience.
  • After landing at STL, you can visit several nearby cities and towns. The airport allows you to visit Saint Ann, Edmundson, Hazelwood, Bridgeton Terrace, Berkeley, Woodson Terrace, Schuermann Heights, and Robertson. The airport has an incredible transport network to help you get to these places by bus, taxi, or rental car.

Prefer to fly direct from Chicago O'Hare Airport 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 O'Hare Intl to Lambert-St Louis.
Find which airlines fly direct from Chicago O'Hare Intl Airport to Lambert-St Louis Airport, which days they fly and book direct flights.

Direct departures

Chicago O'Hare Intl to Lambert-St Louis

Monday

ANA, Aer Lingus, Air Canada, +18 more

ANA, Aer Lingus, +19 more

Tuesday

ANA, Aer Lingus, Air Canada, +18 more

ANA, Aer Lingus, +19 more

Wednesday

ANA, Aer Lingus, Air Canada, +17 more

ANA, Aer Lingus, +18 more

Thursday

ANA, Aer Lingus, Air Canada, +18 more

ANA, Aer Lingus, +19 more

Friday

ANA, Aer Lingus, Air Canada, +18 more

ANA, Aer Lingus, +19 more

Saturday

ANA, Aer Lingus, Air Canada, +18 more

ANA, Aer Lingus, +19 more

Sunday

ANA, Aer Lingus, Air Canada, +17 more

ANA, Aer Lingus, +18 more

See more direct flights

Direct returns

Lambert-St Louis to Chicago O'Hare Intl

Monday

ANA, Aer Lingus, Air Canada, +18 more

ANA, Aer Lingus, +19 more

Tuesday

ANA, Aer Lingus, Air Canada, +17 more

ANA, Aer Lingus, +18 more

Wednesday

ANA, Aer Lingus, Air Canada, +17 more

ANA, Aer Lingus, +18 more

Thursday

ANA, Aer Lingus, Air Canada, +18 more

ANA, Aer Lingus, +19 more

Friday

ANA, Aer Lingus, Air Canada, +18 more

ANA, Aer Lingus, +19 more

Saturday

ANA, Aer Lingus, Air Canada, +18 more

ANA, Aer Lingus, +19 more

Sunday

ANA, Aer Lingus, Air Canada, +17 more

ANA, Aer Lingus, +18 more

See more direct flights

Reviews of the top 3 airlines serving from O'Hare Intl 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 O'Hare Intl 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.
7.4
United AirlinesOverall score based on 8896 reviews
7.3Comfort
7.7Boarding
6.6Food
8.1Crew
7.1Entertainment
Airline reviews

It was delayed instead of departing at 9:20pm, we departed at 11pm… putting us in Columbus after 2am! It was awful. Had I known about the delay, I could have spent some time in the United Lounge… I was starving because I started my journey in Budapest… so I was exhausted and hungry. Plus I had to make new arrangements to be picked up at the airport in Columbus, instead of midnight it was 2:30 am after getting luggage and out of airport. Not feasible. I would have just stayed in Chicago for the night and gotten a morning flight.

10.0 ExcellentAnita, Jul 2025ORD - CMH
Read more United Airlines reviews

It was delayed instead of departing at 9:20pm, we departed at 11pm… putting us in Columbus after 2am! It was awful. Had I known about the delay, I could have spent some time in the United Lounge… I was starving because I started my journey in Budapest… so I was exhausted and hungry. Plus I had to make new arrangements to be picked up at the airport in Columbus, instead of midnight it was 2:30 am after getting luggage and out of airport. Not feasible. I would have just stayed in Chicago for the night and gotten a morning flight.

It was great, I’m very grateful for the pilots and crew flight attendants for everything.

Evidently, my seat had the only broken TV. I couldn’t plug it in, get it to come on, or watch anything, and of course, no one could fix it while we were on the plane. The service was good and the boarding was quick

I was charged for my daughters bag when I am supposed to receive two free checked bags with my United Explorer card.

The schedule to Moline changed 5 times. The gate changed 6 times. That is a pathetic way to run an airline. No wonder that no one in our company flies on United Express to or from Moline. Changes happen most of the time. I learned my lesson on this trip…never again!

Flight was great. Efficient boarding. Short flight. Early arrival. Friendly flight crew. The entertainment system did not work well. Could not access it until the aircraft reached 10K feet or more. Lots of glitches.

A bit rush for transit. Food and entertainment are not available

Smooth boarding process. Early departure, smooth flight, early arrival. The entertainment package has very good recent movie options. The flight crew were friendly and professional.

My flight was scheduled for about 6:05 departure. There were 11 gate changes from 4-7pm and the flight was 3 hours delayed due to operational issues. The plane taxied around the airport for about half an hour before stopping to be de-iced. It would have been nice if we were alerted of the plan to de-ice prior to the 30 minute drive around the airport. The flight attendant was friendly, which was the only redeeming thing about this flight. As a former flight attendant for United, I was extremely disappointed.

Delays took 2hours and thirty minutes making me miss my connecting flight and make me sit in the Chicago airport for 9 hours

3 hour weather delay followed by 1 hour (and counting) maintenance delay. UGH!

After we'd boarded , they canceled the flight. The crew didn't even know , we just all received text messages. Then after they deplaned us , AA was just like "too bad, go F your self, we sure ain't gonna help you"

After a two hour delay, my flight was CANCELLED! No pilot available. Such BS.

Amazing food, great staff, with one noticable detail missing ...but no seat entertainment in any of aircraft ...I am not a fan

I wish American Airlines would change the airline industry by loading the plane back to front instead of front to back. Planes would board so much more smoothly and quickly.

I have long legs, my foot was out in the aisle and when a flight attendant came walking by and I didn't notice, instead of saying "excuse me" or anything like that, she kicked my foot. Extremely rude

Excellent! The gate agents were kind enough to rebook me on an earlier flight saving me from a 6 hour layover. Even my luggage made it despite the fact that the connection was technically too narrow. The flight itself was very comfortable, roomy, and clean. Plenty of space for my carryon items with plugs to charge my phone. After a long international flight of 14 hours, this was an excellent way to end my travels!

Great experience. Flight boarded easily. Departed early. Smooth flight. Great arrival in DC--almost no taxing! Almost direct to gate from runway. Crew was terrific. Same cookies and beverages in main cabin. I did not use the entertainment system on this flight.

Most of the delay was due to weather which is not what was at issue here. One delay was due to a missing flashlight and in the end the flashlight was actually found on the plane. The entertainment system is very limited. Live TV options offer only a few channels that are not very appealing. Boarding and deplaning are always difficult. It just takes too much time to get on and off the plane. On the plus side, I missed my connecting flight, but was easily able to book a later flight from the app while enroute.

Improvements in communication and empathy are absolutely necessary for American Airlines staff (top down). It’s like they are numb to the needs of their customers.

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.

Flight was cancelled, communication was poor and should have canceled flight much earlier.

Flight was cancelled twice. Moved four more times. Probably the least timely and poorly run airline I have ever experienced in my life. I have traveled hundreds of times to dozens of countries and this one takes the cake.

Excellent crew, good flight. Flight was delayed about 1 1/2 hours though.

Pros: "The ground crew and flight crew were great."
Cons: "Would have appreciated easier steps (lower risers) for boarding. Arthritic knee makes it hard for me to manage the high risers between steps. Also having armrests would have made the flight more comfortable."

Everything you need to know for your flight from O'Hare Intl to St. Louis

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.