ORD - STL

$48 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 4/28. 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
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Everything you should know

Cheapest round-trip
$97
Overall average: $345
United Airlines
Wed 2/25Wed 3/4
ORD - STL • Non-stop
Cheapest one-way
$49
Typical prices: $118-$336
United Airlines
Tue 4/28
ORD - STL • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
American's Basic Economy has no seat assignment.
Expect long lines at O'Hare during peak hours.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
United Airlines
Cheapest • from $97 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 61% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
December
Cheapest • 29% price drop
October
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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Flight Deals
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Expert advice
Flight 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, Feb 25 - Wed, Mar 4
United Airlines Logo
7:40 pm - 9:05 pm
ORD
-
STL
1h 25mnonstop
United Airlines Logo
7:41 am - 9:10 am
STL
-
ORD
1h 29mnonstop
$97United Airlines
Wed, Feb 25 - Wed, Mar 4
Southwest Logo
2:15 pm - 8:35 pm
ORD
-
STL
6h 20m
1 stop
Southwest Logo
8:15 am - 12:15 pm
STL
-
ORD
4h 00m
1 stop
$117Southwest
Tue, Feb 17 - Fri, Feb 20
Frontier Logo
6:02 pm - 6:51 am
ORD
-
STL
12h 49m
1 stop
Frontier Logo
8:20 pm - 10:39 pm
STL
-
ORD
26h 19m
1 stop
$133Frontier
Sat, Feb 21 - Wed, Feb 25
United Airlines Logo
7:40 pm - 9:05 pm
ORD
-
STL
1h 25mnonstop
United Airlines Logo
7:41 am - 9:10 am
STL
-
ORD
1h 29mnonstop
$134United Airlines
Tue, Mar 3 - Fri, Mar 6
Frontier Logo
8:30 am - 10:27 pm
ORD
-
STL
13h 57m
1 stop
Frontier Logo
1:09 pm - 10:39 pm
STL
-
ORD
9h 30m
1 stop
$139Frontier
Wed, Mar 4 - Sat, Mar 7
Multiple Airlines Logo
12:44 pm - 10:27 pm
ORD
-
STL
9h 43m
1 stop
Multiple Airlines Logo
8:12 pm - 8:43 am
STL
-
ORD
12h 31m
1 stop
$141Multiple Airlines
Tue, Feb 17 - Wed, Feb 18
Frontier Logo
6:02 pm - 6:51 am
ORD
-
STL
12h 49m
1 stop
Frontier Logo
8:17 pm - 10:51 am
STL
-
ORD
14h 34m
1 stop
$142Frontier
Thu, Feb 19 - Mon, Feb 23
Frontier Logo
5:05 am - 6:51 am
ORD
-
STL
25h 46m
1 stop
Frontier Logo
8:22 pm - 10:51 am
STL
-
ORD
14h 29m
1 stop
$145Frontier
Thu, Feb 19 - Mon, Feb 23
Frontier Logo
4:16 pm - 1:09 pm
ORD
-
STL
20h 53m
1 stop
Frontier Logo
3:49 pm - 11:15 pm
STL
-
ORD
7h 26m
1 stop
$149Frontier
Wed, Feb 25 - Wed, Mar 4
Multiple Airlines Logo
8:16 pm - 6:51 am
ORD
-
STL
34h 35m
2 stops
Multiple Airlines Logo
5:18 pm - 11:14 pm
STL
-
ORD
29h 56m
1 stop
$152Multiple Airlines
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 Wednesday 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 Wednesdays.

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 December, where tickets cost $213 (return) on average. On the other hand, the most expensive months are January and February, where the average cost of round-trip tickets is $521 and $345 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 61% 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 O'Hare Intl 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 and ORD

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.

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 seasonJuly
Cheapest flight$49
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly and prices are also 14% 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 $49 for a one-way ticket and $97 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, 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 Embraer 170 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 $327 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 $313 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 $208 or less one-way and $367 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

American Airlines, United Airlines

American Airlines, United Airlines

Tuesday

American Airlines, United Airlines

American Airlines, United Airlines

Wednesday

American Airlines, United Airlines

American Airlines, United Airlines

Thursday

American Airlines, United Airlines

American Airlines, United Airlines

Friday

American Airlines, United Airlines

American Airlines, United Airlines

Saturday

American Airlines, United Airlines

American Airlines, United Airlines

Sunday

American Airlines, United Airlines

American Airlines, United Airlines

See more direct flights

Direct returns

Lambert-St Louis to Chicago O'Hare Intl

Monday

American Airlines, United Airlines

American Airlines, United Airlines

Tuesday

American Airlines, United Airlines

American Airlines, United Airlines

Wednesday

American Airlines, United Airlines

American Airlines, United Airlines

Thursday

American Airlines, United Airlines

American Airlines, United Airlines

Friday

American Airlines, United Airlines

American Airlines, United Airlines

Saturday

American Airlines, United Airlines

American Airlines, United Airlines

Sunday

American Airlines, United Airlines

American Airlines, United Airlines

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 9215 reviews
8.1Crew
7.3Comfort
7.7Boarding
7.1Entertainment
6.6Food
Airline reviews

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

8.0 ExcellentAnonymous, Jan 2026
ORD - TPA
Read more United Airlines reviews

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. :/

Great flight. On time boarding. Smooth flight and on time arrival at EWR. The flight crew was marvelous and there was a great selection of movies on the entertainment system. Our bags were at the carousel before we got there. Another excellent flight from United.

I liked the snacks and the flight attendants were friendly.

After a delay at the gate, C3, at Ohare on Sunday, I left my Blk ski coat on the bench at the gate, lost! Please review my lob claim, thx.

Very thoughtful flight attendant offered me water immediately since I had run to make my connection.

Always wish for more healthy, gluten free options. We have to bring our own.

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

We experienced gate changes and a long delay. My seat was dirty when I boarded and I had to use wipes to clean it myself. There was an unpleasant and overpowering cleaning product scent on the plane as well that lingered through the flight.

My carry on baggage was damaged. Entire trip, I had to carry the baggage. When complained to the boarding crew, they got mad at me and still asked me to valet check in the cabin baggage. Rude boarding crew!!!

Crew were all friendly and helpful. It was a short flight so just a beverage service with a cookie. After we were boarded the plane took about 45 minutes to leave the gate but it was New Year’s Eve so not shocking there was some delay. Overall good experience and very grateful.

The boarding process needs to be fixed. The zone don't work, especially when there is hardly anyone in zones 3, 4,and 5, leaving the majority of the passengers backed up in the aisle, especially because passengers seated near the front are blocking passengers who are seated in the rear of the plane. It would also help if the size of carry on bags was more strictly enforced.

The boarding by groups is pointless. The first two groups worked fine, but almost Noone boarded in goups three thru five leaving the vast majority boarding when group six was called. It defeated the purpose of spreading out the crowd.

We loved the steward on the plane. He made the night enjoyable

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 O'Hare Intl to St. Louis

Information on your arrival and departure airports