Cheap Flights from St Louis to Chicago

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Flight deals from St Louis to Chicago

Looking for a cheap last-minute deal or the best return flight from St Louis to Chicago? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from St Louis to Chicago

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Chicago flights are currently cheapest in September.

Direct flights from St Louis to Chicago

Alternative St Louis to Chicago routes

Looking for the cheapest, fastest or easiest route from St Louis to Chicago? You could fly into the following airports instead.

St Louis to Chicago: Flight information

The things to know before you go.
Cheapest flight foundج.م.‏ 2,343
Cheapest month to flySeptember
Average flight time1 hr, 19 mins
Most popular airlineAmerican Airlines
Average flights per week795

Finding cheap flights from St Louis to Chicago: Frequently asked questions

There are 4 airports in Chicago: Chicago Midway, Chicago O'Hare International, Chicago Dupage County, and Chicago Rockford.
The best price we found for a return flight from St Louis to Chicago is ج.م.‏ 4,685. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
1 hour and 18 minutes is the average flight time from St Louis to Chicago.
American Airlines, Alaska Airlines and Southwest Airlines fly direct from St Louis to Chicago.
As of September 2025, there are 795 flights per week flying from St Louis to Chicago.
The cheapest month to fly from St Louis to Chicago is usually October.
If you're flying from St Louis Airport, the cheapest airport near Chicago is Chicago O'Hare International – which is 25.4 km away from the centre of Chicago. We've found flights into this airport from ج.م.‏ 4,685.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Chicago on Wednesday, 22 October 2025.
Yes – the average flight time is 1 hour and 18 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Chicago but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Chicago is around 40 days in advance, so don’t leave your flight to the last minute.
In September, the average temperature is usually around 18°C. July is typically the warmest month in Chicago, when it usually averages around 26°C. You can expect the least rain in January. The coldest month is January, with temperatures averaging -8°C. The rainiest month is August.
Currently, United offers the cheapest flight tickets to Chicago.

Travelling from Lambert-St. Louis International Airport (STL) to Chicago: what you need to know

  • Book a direct flight from Lambert-St. Louis International Airport to Chicago and you'll be in the air for an average of 1 hour 25 minutes.

  • Chicago's timezone is UTC-5, which is the same as St Louis (the location of Lambert-St. Louis International Airport).

  • Lambert-St. Louis International Airport (STL) to O'Hare International Airport (ORD) is the most popular route, with 89 departures a week to choose from. If you have things to do before leaving, the last flight from STL to ORD is with American Airlines at 19:59. Choose the first departure with American Airlines at 05:00 if you want to fly out earlier.

  • Leave plenty of time to make your STL to Chicago flight. A good rule of thumb is to arrive two hours before international departures and an hour ahead for domestic flights.

  • Heading off during a peak time like a bank holiday? Expect longer queues at check-in and security. To give yourself peace of mind, arrive up to four hours before international flights and two hours before domestic departures.

  • Begin your trip at STL and fly nonstop to O'Hare International Airport (ORD). That's where you can expect to land when searching for Lambert-St. Louis International Airport to Chicago tickets.

  • You can choose from various airlines that operate direct flights from Lambert-St. Louis International Airport to Chicago, including:

  • STL is around 16 kilometres from central St Louis. If you're ride-sharing, driving or catching a cab from the centre, it'll take 20 minutes or so to get there, depending on the traffic. If you're planning to take public transport, expect the travel time to be around 35 minutes.

  • Looking for a hotel near STL? If you're catching an early flight from Lambert-St. Louis International Airport to Chicago, these stays will put you moments from your departure lounge:

  • 78.04% of flights taking off from Lambert-St. Louis International Airport touch down at their destination on time.

  • STL's address is 10701 Lambert International Blvd..

How to find the cheapest flights from Lambert-St. Louis International Airport (STL) to Chicago

  • The lowest price we've found for a one-way Lambert-St. Louis International Airport to Chicago flight is ج.م.‏ 2,343. The cheapest price for a return flight is ج.م.‏ 4,685. Bear in mind fares may change due to demand at the time of booking.

  • Lock in cheap flights from STL to Chicago by booking four months ahead. Based on our research, that's the sweet spot for finding the biggest deals.

  • The best month for landing cheap Lambert-St. Louis International Airport to Chicago tickets is August. Use the 'Whole month' tool to compare prices, then select the dates that offer the biggest savings.

  • Stay on top of deals for cheap flights from STL to Chicago by setting up a Price Alert. You'll get an email or push notification on the app when fares go down.

  • Snag an affordable flight from Lambert-St. Louis International Airport to Chicago with the help of our filters. Choose your preferred times, airlines and number of stops, then sort the results by 'Cheapest' for the best deals.

Airports in Chicago

O'Hare International Airport (ORD)

  • O'Hare International Airport (ORD) is around 40 kilometres from central Chicago. If you're grabbing a cab or a ride-share, the drive takes about 35 minutes.

  • It'll take around 55 minutes if you're travelling by public transport.

  • Look into staying at a hotel close to ORD if you're coming in on a late flight from Lambert-St. Louis International Airport to Chicago. Settle into one of these accommodation options and skip the long transfer:

  • Fast-track your adventure by picking up an O'Hare International Airport rental car. Grab your wheels from Routes Car Rentals, Dollar or Budget and experience the lesser-explored corners of Chicago and beyond.

  • Secure the lowest price by reserving your vehicle from O'Hare International Airport around four weeks in advance of your flight from STL to Chicago.

  • The address for ORD is 10000 West O'Hare.

Chicago Midway International Airport (MDW)

  • Once your flight from Lambert-St. Louis International Airport to Chicago has landed, you can reach the city centre in around 20 minutes by car. Central Chicago is roughly 19 kilometres from Chicago Midway International Airport (MDW).

  • If you travel by public transport, you'll reach the centre in 45 minutes or so.

  • You'll find some great places to drop your things at near MDW. Settle in and get cosy after your STL to Chicago flight at one of these perfectly located options:

  • Dollar, Hertz and Budget make picking up a Chicago Midway International Airport rental car quick and easy. These reliable suppliers are located in or around the terminal and will have you ready to go in a flash.

  • Get the pick of the lot. Reserving your ride from MDW four weeks in advance often means more savings and a wider choice of vehicles.

  • You can find Chicago Midway International Airport at 5700 South Cicero.

Chicago Rockford International Airport (RFD)

  • Chicago Rockford International Airport (RFD) is around 137 kilometres from central Chicago. It takes about 1 hour 25 minutes to get to the city centre in a ride-share or cab once you've hopped off your flight from Lambert-St. Louis International Airport to Chicago.

  • If you're using public transport, the journey will take you about 4 hours 15 minutes.

  • Enjoy an unhurried start to your trip by choosing a hotel near RFD after your STL to Chicago flight. Recover from a day of travel or just take a moment to find your footing in a new place at:

  • Whether you'd like a compact for a solo escape or a roomy SUV to fit the whole crew comfortably, you'll find the ideal Chicago Rockford International Airport rental car for your needs. Browse the range of wheels available from providers such as Budget, Alamo and National.

  • Booking at least a few weeks in advance of your flight from Lambert-St. Louis International Airport to Chicago is always a good idea. As well as better deals, you'll be able to choose the vehicle make and model you prefer at RFD.

  • Chicago Rockford International Airport's official address is 2 Airport Cir.

Best time to go to Chicago

  • Carefully consider your dates before booking your flight from Lambert-St. Louis International Airport to Chicago. The city buzzes in peak season, but rates are typically higher and top attractions can be crowded. Go to Chicago in the low season if you prefer a more relaxed vibe.

  • The warmest month in Chicago is July, with temperatures ranging between 15ºC and 29ºC. Lock in your Lambert-St. Louis International Airport to Chicago flight ticket then if that's the weather you find most pleasant.

  • Look for cheap tickets from STL to Chicago in January if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between -12ºC and 3ºC on average.

More about Chicago

Explore more of United States

  • Columbus is just one of the many cities in United States waiting to be explored after you've experienced Chicago. Around 451 kilometres away to the south-east, well-known attractions include Franklin Park Conservatory and Botanical Gardens, Ohio Statehouse and German Village.

  • If there's time to check out another great destination in United States, consider Indianapolis, about 257 kilometres south-east of Chicago. The Children's Museum of Indianapolis, Indianapolis Museum of Art and Indianapolis Zoo are among its highlights.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.