Gateway Arch in St. Louis Missouri, America, USA.

£52 Cheap Flights from Chicago (ORD) to St. Louis (STL)

View £52 flight on Wed, 1 Jul 2026Opens in a new window

Popular airlines from Chicago O'Hare International Airport (ORD) to Lambert-St. Louis International Airport (STL)

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Cheap Flights from Chicago (ORD) to St. Louis (STL)

Prices were available within the past 7 days and start at £52 for one-way flights and £154 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, 30 Jun - Tue, 7 Jul
ORD
Chicago
STL
St. Louis
£154 Return, found 6 days ago
£154
Return
found 6 days ago
Select United flight, departing Tue, 30 Jun from Chicago to St. Louis, returning Tue, 7 Jul, priced at £154 found 6 days ago
American Airlines
Tue, 8 Sept - Wed, 9 Sept
ORD
Chicago
STL
St. Louis
£161 Return, found 9 hours ago
£161
Return
found 9 hours ago
Select American Airlines flight, departing Tue, 8 Sept from Chicago to St. Louis, returning Wed, 9 Sept, priced at £161 found 9 hours ago
Delta
Tue, 8 Sept - Wed, 9 Sept
ORD
Chicago
STL
St. Louis
£176 Return, found 9 hours ago
£176
Return
found 9 hours ago
Select Delta flight, departing Tue, 8 Sept from Chicago to St. Louis, returning Wed, 9 Sept, priced at £176 found 9 hours ago
American Airlines
Wed, 1 Jul - Thu, 2 Jul
ORD
Chicago
STL
St. Louis
£185 Return, found 6 days ago
£185
Return
found 6 days ago
Select American Airlines flight, departing Wed, 1 Jul from Chicago to St. Louis, returning Thu, 2 Jul, priced at £185 found 6 days ago
Delta
Tue, 8 Sept - Wed, 9 Sept
ORD
Chicago
STL
St. Louis
£194 Return, found 9 hours ago
£194
Return
found 9 hours ago
Select Delta flight, departing Tue, 8 Sept from Chicago to St. Louis, returning Wed, 9 Sept, priced at £194 found 9 hours ago
American Airlines
Tue, 8 Sept - Wed, 9 Sept
ORD
Chicago
STL
St. Louis
£196 Return, found 9 hours ago
£196
Return
found 9 hours ago
Select American Airlines flight, departing Tue, 8 Sept from Chicago to St. Louis, returning Wed, 9 Sept, priced at £196 found 9 hours ago
Delta
Fri, 3 Jul - Tue, 7 Jul
ORD
Chicago
STL
St. Louis
£206 Return, found 6 days ago
£206
Return
found 6 days ago
Select Delta flight, departing Fri, 3 Jul from Chicago to St. Louis, returning Tue, 7 Jul, priced at £206 found 6 days ago
United
Tue, 8 Sept - Wed, 9 Sept
ORD
Chicago
STL
St. Louis
£213 Return, found 9 hours ago
£213
Return
found 9 hours ago
Select United flight, departing Tue, 8 Sept from Chicago to St. Louis, returning Wed, 9 Sept, priced at £213 found 9 hours ago
United
Tue, 8 Sept - Wed, 9 Sept
ORD
Chicago
STL
St. Louis
£214 Return, found 9 hours ago
£214
Return
found 9 hours ago
Select United flight, departing Tue, 8 Sept from Chicago to St. Louis, returning Wed, 9 Sept, priced at £214 found 9 hours ago
Alaska Airlines
Wed, 15 Jul - Wed, 22 Jul
ORD
Chicago
STL
St. Louis
£539 Return, found 1 hour ago
£539
Return
found 1 hour ago
Select Alaska Airlines flight, departing Wed, 15 Jul from Chicago to St. Louis, returning Wed, 22 Jul, priced at £539 found 1 hour ago

Frequently asked questions

How much does a flight from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
One-way flights typically cost between $777 and $1,721 and return flights often range between $777 and $1,721. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Anaa (AAA) to Toronto, ON (YYZ-Pearson Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
October is typically the cheapest month to fly from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), with average round-trip fares around 562 CAD. This is about 24% lower than the average price throughout the year. October often sees lower prices as the summer travel rush has ended and before the holiday season begins, leading to reduced demand. Other cheap months to fly from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) include April and August.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Enter ORD to STL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best airline to fly with from Chicago, IL (ORD-O'Hare Intl.) (ORD) to St. Louis, MO (STL-Lambert-St. Louis Intl.) (STL) will differ from traveler to traveler. If you like to fly early, AA offers early morning flights. If price is the most important factor, AA typically offers the lowest fares. AA offers the most daily flights from Chicago, IL (ORD-O'Hare Intl.) (ORD) to St. Louis, MO (STL-Lambert-St. Louis Intl.) (STL), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
When looking for the best time to fly from Chicago O'Hare International Airport (ORD) to St. Louis Lambert International Airport (STL), you'll find that October and April are typically the cheapest months, with average round-trip flights around 562 CAD. While September and June are the most popular months for travel, offering plenty of flight options, they might be a bit pricier. If you're looking to balance good value with a decent selection of flights, consider booking during the shoulder seasons around these months.*Prices based on flights available on Expedia in the last year.
How many flights per day from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
There are approximately 22 nonstop flights per day from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.). For even more choice, look at flights that include layovers. You'll find around 76 connecting flights per day. Some common connection points include Hartsfield-Jackson Atlanta Intl. (ATL), Dallas-Fort Worth Intl. (DFW), and LaGuardia (LGA).
What is the earliest flight from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The earliest flight from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) typically departs at approximately 5:00 AM local time, operated by American Airlines. This is a seasonal service active in February and March. An early departure like this can help maximize your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You'll typically find the most flights from Chicago, IL (ORD-O'Hare Intl.) (ORD) to St. Louis, MO (STL-Lambert-St. Louis Intl.) (STL) on a Thursday, with around 53 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include American Airlines, Delta Air Lines, and United Airlines. Flight schedules are consistent throughout the week.
What are the most popular departure times for flights from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from Chicago O'Hare International Airport (ORD) to St. Louis Lambert International Airport (STL) are in the early morning, from 6am to 9am. About 23% of passengers prefer this time window. Many major carriers, including Delta Air Lines and American Airlines, offer flights during this window. This timing works well for travelers who want to get an early start to their day in St. Louis.
How long does it take to fly from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Flying nonstop from ORD to STL takes around 1 hour 30 minutes, with the route covering approximately 258 miles. Flights with a layover typically take 4 hours 50 minutes longer than direct options. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Select the "Business class" and "First class" filters when looking for ORD to STL flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis from O'Hare Intl. (ORD)?
From O'Hare Intl. (ORD), you can fly into Lambert-St. Louis Intl. (STL) to reach St. Louis. Some flights may connect through major hubs like Love Field (DAL), Harry Reid Intl. (LAS), Denver Intl. (DEN) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
O'Hare Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Return price
£154
Distance
413 km
Average flight time
1 hour 25 mins

Book with confidence

Compare flights from Chicago to St. Louis easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Chicago to St. Louis. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Lambert-St. Louis Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from O'Hare Intl. to Lambert-St. Louis Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from O'Hare Intl. (ORD) to Lambert-St. Louis Intl. (STL)

The easiest way to view the best deals on flights from Chicago to St. Louis today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from O'Hare Intl. to Lambert-St. Louis Intl. start at just £154 and range up to £539.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Chicago and St. Louis
  • booking your flight during June, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Chicago to St. Louis flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from O'Hare Intl. to Lambert-St. Louis Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Chicago to St. Louis easily and book with confidence

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*Available to Expedia members.