£201 Cheap Flights from St. Louis (STL) to Chicago (ORD)

View £201 flight on Tue, 18 Aug 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at £201 for one-way flights and £538 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Wed, 20 May - Wed, 27 May
STL
St. Louis
ORD
Chicago
£538 Return, found 3 days ago
£538
Return
found 3 days ago
Select Alaska Airlines flight, departing Wed, 20 May from St. Louis to Chicago, returning Wed, 27 May, priced at £538 found 3 days ago
Alaska Airlines
Tue, 9 Jun - Tue, 16 Jun
STL
St. Louis
ORD
Chicago
£539 Return, found 3 days ago
£539
Return
found 3 days ago
Select Alaska Airlines flight, departing Tue, 9 Jun from St. Louis to Chicago, returning Tue, 16 Jun, priced at £539 found 3 days ago
Alaska Airlines
Tue, 9 Jun - Tue, 16 Jun
STL
St. Louis
ORD
Chicago
£546 Return, found 3 days ago
£546
Return
found 3 days ago
Select Alaska Airlines flight, departing Tue, 9 Jun from St. Louis to Chicago, returning Tue, 16 Jun, priced at £546 found 3 days ago
Alaska Airlines
Wed, 20 May - Wed, 27 May
STL
St. Louis
ORD
Chicago
£554 Return, found 3 days ago
£554
Return
found 3 days ago
Select Alaska Airlines flight, departing Wed, 20 May from St. Louis to Chicago, returning Wed, 27 May, priced at £554 found 3 days ago
Alaska Airlines
Wed, 20 May - Wed, 27 May
STL
St. Louis
ORD
Chicago
£570 Return, found 3 days ago
£570
Return
found 3 days ago
Select Alaska Airlines flight, departing Wed, 20 May from St. Louis to Chicago, returning Wed, 27 May, priced at £570 found 3 days ago
Alaska Airlines
Tue, 9 Jun - Tue, 16 Jun
STL
St. Louis
ORD
Chicago
£587 Return, found 3 days ago
£587
Return
found 3 days ago
Select Alaska Airlines flight, departing Tue, 9 Jun from St. Louis to Chicago, returning Tue, 16 Jun, priced at £587 found 3 days ago
Alaska Airlines
Tue, 9 Jun - Tue, 16 Jun
STL
St. Louis
ORD
Chicago
£589 Return, found 3 days ago
£589
Return
found 3 days ago
Select Alaska Airlines flight, departing Tue, 9 Jun from St. Louis to Chicago, returning Tue, 16 Jun, priced at £589 found 3 days ago
Alaska Airlines
Thu, 14 May - Thu, 21 May
STL
St. Louis
ORD
Chicago
£593 Return, found 3 days ago
£593
Return
found 3 days ago
Select Alaska Airlines flight, departing Thu, 14 May from St. Louis to Chicago, returning Thu, 21 May, priced at £593 found 3 days ago
Alaska Airlines
Tue, 9 Jun - Tue, 16 Jun
STL
St. Louis
ORD
Chicago
£598 Return, found 3 days ago
£598
Return
found 3 days ago
Select Alaska Airlines flight, departing Tue, 9 Jun from St. Louis to Chicago, returning Tue, 16 Jun, priced at £598 found 3 days ago
Alaska Airlines
Wed, 20 May - Wed, 27 May
STL
St. Louis
ORD
Chicago
£601 Return, found 4 days ago
£601
Return
found 4 days ago
Select Alaska Airlines flight, departing Wed, 20 May from St. Louis to Chicago, returning Wed, 27 May, priced at £601 found 4 days ago

Frequently asked questions

What is the cheapest month to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
September is typically the cheapest month to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.), with average return fares of approximately £148. This is about 27% lower than the average price throughout the year. September often sees lower prices as the summer travel rush ends and before the holiday season begins, leading to reduced demand. Other cheap months to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.) include March and August.
Which airlines fly direct from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
Enter STL to ORD and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
To find a cheap flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
The best airline to fly with from St. Louis, MO (STL-Lambert-St. Louis Intl.) (STL) to Chicago, IL (ORD-O'Hare Intl.) (ORD) will differ from traveller to traveller. If you like to fly early, AA offers early morning flights. If price is the most important factor, AA typically offers the lowest fares. DL offers the most daily flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) (STL) to Chicago, IL (ORD-O'Hare Intl.) (ORD), 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
The best time to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.) is September. This month offers a great balance, as it's one of the cheapest times to fly, with average return flights around £148. Plus, September is also a very popular month for this route, meaning you'll have plenty of flight options to choose from. If September doesn't work, March is another affordable option, though it might have fewer flight choices.
How many flights per day from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
There are approximately 23 nonstop flights per day from Lambert-St. Louis Intl. (STL) to O'Hare Intl. (ORD). For even more choice, look at flights that include layovers, as there are around 62 connecting flights per day. Some common connection points include Hartsfield-Jackson Atlanta Intl. (ATL), Dallas-Fort Worth Intl. (DFW), and Charlotte-Douglas Intl. (CLT).
What is the earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
The earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) (STL) to Chicago, IL (ORD-O'Hare Intl.) (ORD) typically departs at approximately 5:00 AM local time, operated by American Airlines. This is a seasonal service active in May and June. An early departure like this can help maximise 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
You'll find the most flights from Lambert-St. Louis Intl. (STL) to O'Hare Intl. (ORD) on a Friday, 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 Southwest Airlines. Fridays offer notably more flight options compared to other days of the week, making it a good day to consider for your journey.
What are the most popular departure times for flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
The most popular departure times for flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) (STL) to Chicago, IL (ORD-O'Hare Intl.) (ORD) are in the morning, from 6am to 9am. About 30% of passengers prefer this time. Many major carriers, including Delta Air Lines and American Airlines, offer flights during this window. This timing works well because you can get an early start to your day in Chicago.
How long does it take to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
Direct flights from STL to ORD usually take about 1 hour 30 minutes, traveling roughly 258 miles. If you opt for a connecting flight, expect to add around 5 hours 20 minutes to your journey. 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
Select the "Business class" and "First class" filters when looking for STL to ORD 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.) flight with Expedia?
It's easy to earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare 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 Chicago from Lambert-St. Louis Intl. (STL)?
From Lambert-St. Louis Intl. (STL), you can fly into Midway Intl. (MDW) and O'Hare Intl. (ORD) in Chicago. Some flights may connect through major hubs like Baltimore Washington Intl. Thurgood Marshall (BWI), Clinton National Airport (LIT), Love Field (DAL) before reaching Chicago. 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.) at the last minute?
Typically, booking a last minute flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.) flight and hotel package?
Securing a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
If you booked your St. Louis, MO (STL-Lambert-St. Louis Intl.) to Chicago, IL (ORD-O'Hare 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
Lambert-St. Louis Intl.
Destination airport
O'Hare Intl.
Airlines serving
Alaska Airlines
Return price
£537
Distance
413 km
Average flight time
1 hour 27 mins

Book with confidence

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

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

The easiest way to view the best deals on flights from St. Louis to Chicago 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 Lambert-St. Louis Intl. to O'Hare Intl. start at just £538 and range up to £601.  

To find an even better deal, try  

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

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

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Lambert-St. Louis Intl. to O'Hare 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 St. Louis to Chicago easily and book with confidence

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