STL - ORD

$49 Find Cheap Flights from St. Louis to Chicago O'Hare Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to O'Hare Intl departing on 11/4. 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 Chicago O'Hare Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Chicago, 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 St. Louis to Chicago, as well as popular online travel agencies
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Flights Deals

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

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

Thu, Aug 21 - Thu, Sep 4
American Airlines Logo
7:23 am - 8:48 amSTL-ORD
1h 25mnonstop
American Airlines Logo
5:47 pm - 7:13 pmORD-STL
1h 26mnonstop
$97American Airlines
Find Deal
Wed, Aug 6 - Mon, Aug 18
American Airlines Logo
6:06 am - 7:30 amSTL-ORD
1h 24mnonstop
American Airlines Logo
6:52 pm - 8:18 pmORD-STL
1h 26mnonstop
$98American Airlines
Find Deal
Tue, Aug 5 - Wed, Aug 6
Southwest Logo
6:25 am - 12:45 pmSTL-ORD
6h 20m1 stop
Southwest Logo
1:50 pm - 9:55 pmORD-STL
8h 05m1 stop
$117Southwest
Find Deal
Mon, Aug 18 - Tue, Aug 19
Southwest Logo
5:10 am - 10:45 amSTL-ORD
5h 35m1 stop
Southwest Logo
7:00 am - 5:50 pmORD-STL
10h 50m2 stops
$128Southwest
Find Deal
Wed, Aug 13 - Fri, Aug 15
United Airlines Logo
8:00 am - 9:25 amSTL-ORD
1h 25mnonstop
United Airlines Logo
2:23 pm - 3:47 pmORD-STL
1h 24mnonstop
$161United Airlines
Find Deal
Fri, Jul 25 - Sun, Jul 27
Southern / Mokulele Logo
1:00 pm - 4:32 pmSTL-ORD
3h 32m1 stop
Southern / Mokulele Logo
8:15 am - 12:10 pmORD-STL
3h 55m1 stop
$166Southern / Mokulele
Find Deal
Thu, Jul 3 - Tue, Jul 8
Southern / Mokulele Logo
9:20 am - 7:37 amSTL-ORD
22h 17m1 stop
Southern / Mokulele Logo
1:10 pm - 4:45 pmORD-STL
3h 35m1 stop
$167Southern / Mokulele
Find Deal
Sat, Nov 8 - Tue, Nov 11
Delta Logo
10:51 am - 4:38 pmSTL-ORD
5h 47m1 stop
Delta Logo
6:00 am - 10:40 amORD-STL
4h 40m1 stop
$177Delta
Find Deal
Sat, Sep 27 - Sat, Sep 27
Delta Logo
6:30 am - 12:39 pmSTL-ORD
6h 09m2 stops
Delta Logo
5:20 pm - 11:02 pmORD-STL
5h 42m1 stop
$182Delta
Find Deal
Sun, Aug 24 - Wed, Aug 27
United Airlines Logo
11:30 am - 1:00 pmSTL-ORD
1h 30mnonstop
United Airlines Logo
2:20 pm - 3:44 pmORD-STL
1h 24mnonstop
$213United Airlines
Find Deal
Expert advice

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

 
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
Qatar Airways

Economy includes a free checked bag and seatback TV for entertainment.


Check for Qsuites in Business Class for a suite-style experience with privacy.

ANA

ANA offers 34 inches of legroom in economy on 787-9 and 787-10 aircraft.


Premium economy includes lounge access when departing from Tokyo or Honolulu.

Read more about ANAby Gabriel Leigh
Lufthansa

Economy Light is ideal for carry-on only travel, offering savings on short trips.


Economy Classic includes a checked bag up to 50 lbs.

Read more about Lufthansaby Jessica Macdonald
British Airways

BA's economy fares include a carry-on bag, avoiding surprise fees.


Premium economy offers seven inches more legroom for long-haul comfort.

American Airlines

Consider Basic Economy for budget travel with carry-on only, but check restrictions carefully.


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

United Airlines

Economy Plus offers up to six inches more legroom than standard economy.


Consider Priority Boarding to ensure overhead bin space for carry-ons.

Airports
STL

Avoid peak hours at STL to minimize wait times at security and baggage claim, especially in Terminal 2.

Read more about STLby Yulia Denisyuk
ORD

Take the CTA Blue Line from ORD to downtown Chicago for a reliable 45-minute commute, avoiding traffic delays.

Read more about ORDby Stefanie Waldek
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Qatar Airways, 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
Gabriel Leigh

Gabriel Leigh

Expert on ANA

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Jessica Macdonald

Jessica Macdonald

Expert on Lufthansa

Jessica Macdonald

Jessica Macdonald

Currently based in Scotland after living in South Africa and the United States, Jessica has been writing travel and aviation content for more than 10 years. She regularly contributes to Travel + Leisure and TripSavvy, and has had work published by Condé Nast Traveller and The Independent. She has traveled to more than 50 countries across six continents.

Read more
Duncan Madden

Duncan Madden

Expert on British Airways

Duncan Madden

Duncan Madden

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Read more
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
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
Useful Info

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

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

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Chicago O'Hare Intl Airport, 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 St. Louis to Chicago O'Hare Intl Airport is August, where tickets cost $198 (return) on average. On the other hand, the most expensive months are June and January, where the average cost of round-trip tickets is $316 and $297 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Chicago O'Hare Intl Airport, 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 St. Louis to Chicago O'Hare Intl Airport, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 9 weeks before departure.

Good to know

Low seasonFebruary
High seasonMarch
Cheapest flight$49
Best time to beat the crowds but there is an average 11% increase in price.
Most popular time to fly with an average 4% increase in price.
Flight from St. Louis to Chicago O'Hare Airport

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

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

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

    In the last 3 days, the lowest price for a flight from St. Louis to Chicago O'Hare Intl Airport was $49 for a one-way ticket and $97 for a round-trip.

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

    No

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

    St. Louis and Chicago O'Hare Airport are both served by 1 main airport. You will leave St. Louis from Lambert-St Louis and will be arriving at Chicago O'Hare Intl.

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

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

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

    The Airbus A319 is the aircraft model that flies most regularly on the St. Louis to Chicago O'Hare Airport flight route.

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

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

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

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

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

    The two airlines most popular with KAYAK users for flights from St. Louis to Chicago are United Airlines and American Airlines. With an average price for the route of $306 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 $268 and an overall rating of 7.2.

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

    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 St. Louis to Chicago O'Hare Airport.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Chicago O'Hare Airport from St. Louis 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 St. Louis to Chicago O'Hare Airport?

    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 Chicago O'Hare Airport with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and ORD 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 St. Louis to Chicago O'Hare Airport?

    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 Chicago O'Hare Airport from St. Louis 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 St. Louis to Chicago O'Hare Intl Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for $201 or less one-way and $457 or less round-trip.

Prefer to fly direct from St. Louis to Chicago O'Hare Airport?

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

Direct departures

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, +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

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
See more direct flights

Top 3 airlines serving from St. Louis to O'Hare Intl

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Chicago. 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 St. Louis to O'Hare Intl? 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 8790 reviews
6.6Food
7.7Boarding
8.1Crew
7.0Entertainment
7.3Comfort
Airline reviews

It was fine, definitely older planes with no charging or anything. There’s no entertainment set up on board, but it is nice that they allow you to access the in flight entertainment from your phone without having to pay for the Wi-Fi and they do offer free texting.

6.0 GoodAnonymous, Jun 2025MLI - ORD
Read more United Airlines reviews

It was fine, definitely older planes with no charging or anything. There’s no entertainment set up on board, but it is nice that they allow you to access the in flight entertainment from your phone without having to pay for the Wi-Fi and they do offer free texting.

I liked that the flight was nonstop from ORD to CIU for $200 round trip.

While the staff was pleasant and helpful, the following observations are for your awareness. There was some delay on the tarmac on take off and landing. The paid lunch/food offerings were limited. Entertainment was only available on WiFi at a cost.

The first flight was better in terms of the aircraft.

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

Overall poor for me I paid extra for seats with leg room and my regional flights exit row seats have less leg room then the others that's money that could have been saved and on my final flight home the flights air was not operating it was unbearably hot in the cabin I will be contacting United and filing a DOT complaint

There's just no way to sit fully upright and comfortably in these seats. There needs to be 2 more inches of room, and that's not something that only one person on the flight needs - the whole flight needs 2 more inches of room. If that means you sell 6 less seats, so be it. It's too close for anyone. Forcing people to pay for "premium" economy just to get "barely enough space to breathe" isn't really an answer to that.

The crew were very nice. The Chocolate is good and v there’s no entertainment. Thanks

The crew were very nice. I would have appreciated a pillow for comfort. I had a special meal that was sloppy, but the salad was great. Thanks

The plane was in Moline all night. Consequently, we assumed an on time departure at 8:15am. Unfortunately, and as is the normal case with United in Moline, we departed 2.5 hours late. When the crew came, it was discovered that there was very little heat in the plane. Seems this should have been checked hours before the crew arrived. Then when we boarded and the plane was to be de-iced, the United de-icing truck was not working! We awaited the American Airlines truck. All of this caused us to miss our connection in Chicago. My suggestion is never take United Airlines flight from Moline. We have been disappointed 80% of the time and have vowed to not take United again from Moline.

Most miserable flight ever. We waited almost 2 hours on the runway because the flight was oversold. American offered $1200 credit. Then there was some nonsense about weight distribution. Ridiculous. No food for 8 plus hours on the flight. I will be writing a letter.

The flight was 2 hour delayed, otherwise everything was excellent. The delay was due to the hourly limit requirement so given that as a reason, I'm happy with the flight!

Not sure the logic of the boarding in Groups. I was loaded first on the aisle. Then the guy in the middle. Then the guy by the window. Constantly holding up the other people boarding behind them with us blocking the aisle and this happened in most of the other rows

To start, I’d like to say that every American Airline personnel I interacted with on the ground, especially flight crew, was very friendly and did their best to help me out. Despite this, however, my experience with the airline was an entire mess. The 7:19 PM flight was heavily delayed due to weather, and pushed to 10:30 AM the next morning. Because of this, I had to spend the night inside of the airport. At some point later in the night, I got an email saying that the flight had been canceled. I called the support number, and the representative on the other line told me that the flight was still on and that I didn’t need to rebook. The next morning, no one came to the gate to open the door for the crew until almost 11 AM. By this time the flight crew had been waiting for over an hour, and they had called management to get someone to open the door for them multiple times. Around 11:30, the gate screen had changed to a different flight. I ended up buying a last minute ticket with Southwest airline just to get to Chicago, because the next flight with American wasn’t until 7:19 pm that day. Now, earlier that morning my suitcase had been sent ahead of me to ORD. I went to baggage claim to ask them if I could have my suitcase forwarded to where I was staying. The representative at SDF baggage claim said they could and put the claim in for me. As I was going back through TSA, I got an email that the airline had found my suitcase, but the next step was to send it BACK to SDF. I called the airline support number again, and I made it clear that my suitcase needed to stay in Chicago and to not come back to SDF. The representative told me that they would hold my suitcase at ORD and that it wasn’t going to be forwarded anywhere. Once I got there, I found that they had loaded my suitcase onto a plane to send it back to SDF. Thankfully, I had gotten to the baggage claim counter in time for them to put in a request to bring my suitcase back up. My refund with the airline is processing already, but because of this entire experience and miscommunication at every turn of the way, I will not book with American Airlines in the future.

The plane was late and then sat on the runway for almost 45 minutes before taking off.

Crew professional. Easy bag drop off. On time. Good entertainment.

Everything was great. Boarding, early departure, early arrival, and deplaning were smooth. Smooth flight.

Per usual, flight status, staff courtesy and professionalism were excellent

The only thing is if Wi-Fi is available after you land and taxi to the gate. It takes forever to get to the gate, and having the Wi-Fi continue would be great to bide the time at least 5 minutes before you arrive at the entrance. That is my only comment; otherwise, everything was good.

Had to wait on pilot and crew to depart and had to wait to arrive at the gate because they only had 2 crews working. Delays, delays....Planes just keep getting smaller and tighter and they nickle and dime for everything. When will an airline actually wake up and make flying more enjoyable?

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 St. Louis to O'Hare Intl

Information on your arrival and departure airports

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