Cheap Flights from St Louis to Chicago

Travellers and cabin class

Compare St Louis to Chicago flight deals

Find the cheapest month or even day of the year to fly to Chicago

Book the best Chicago fare with no extra fees

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 April.

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 found$155
Cheapest month to flyApril
Average flight time1 hr, 17 mins
Most popular airlineAmerican Airlines
Average flights per week2,720

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 $155. 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 17 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 March 2025, there are 2,720 flights per week flying from St Louis to Chicago.
The cheapest month to fly from St Louis to Chicago is usually March 2025.
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 $155.
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, 23 April 2025.
Yes – the average flight time is 1 hour and 17 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 March, the average temperature is usually around 3°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

  • The average length of a direct flight from Lambert-St. Louis International Airport to Chicago is 1 hour 21 minutes.

  • Chicago and St Louis (where Lambert-St. Louis International Airport is located) share the UTC-5 timezone. That means you won't have to adjust your watch when you arrive.

  • Lambert-St. Louis International Airport (STL) to O'Hare International Airport (ORD) is the most popular route, with 117 flights a week to pick from. If you have things to do before heading off, the last flight from STL to ORD is with American Airlines at 18:27. Opt for the first departure with American Airlines at 06:00 if you want to get going early.

  • For a stress-free journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. This will give you plenty of time to catch your flight from STL to Chicago.

  • If you're flying during a popular month like July, get to the airport even earlier. It's wise to arrive up to four hours before international flights and two hours ahead of domestic departures. Check-in and security lines are longer during holiday periods like spring break and summer.

  • Direct flights from Lambert-St. Louis International Airport (STL) to Chicago are available for booking. O'Hare International Airport (ORD) is where you'll be landing.

  • Leading carriers that operate direct flights from Lambert-St. Louis International Airport to Chicago include:

  • Once you've booked cheap tickets from Lambert-St. Louis International Airport to Chicago, get your documents ready. A passport or visa isn't needed since you're travelling within United States. As long as you have another valid proof of identity, such as a driver's licence or an ID card, you're ready to go.

  • STL is around 26 kilometres from central St Louis. If you're driving, catching a cab or ride-sharing from the centre, it'll take you 21 minutes or so to get there, depending on traffic. If you're taking public transport, expect the travel time to be approximately 36 minutes.

  • Looking for a convenient hotel near STL? If you're catching an early flight from Lambert-St. Louis International Airport to Chicago, these accommodation options will have you moments from check-in:

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

  • The lowest price we've seen for a one-way ticket from Lambert-St. Louis International Airport to Chicago is $77. The cheapest price for a return flight is $155. Bear in mind fares can change due to demand at the time of booking.

  • To score cheap tickets from STL to Chicago, book as early as possible. Airlines typically offer lower prices when flights are first made available.

  • The 'Whole month' tool shows you the cheapest tickets from Lambert-St. Louis International Airport to Chicago throughout the entire month. It's a good way to snap up a bargain if your dates aren't set in stone.

  • Log into your online account or use the app to create a Price Alert. You'll get notified right away if there's a better deal on this route. It doesn't take long, and it'll save you from checking for flight tickets from STL to Chicago every day.

  • Use the filters to tailor your flights from Lambert-St. Louis International Airport to Chicago. Simply select your ideal arrival and departure times, number of stops and airlines. Or sort your results by 'Cheapest' to find the best deals.

Airports in Chicago

O'Hare International Airport (ORD)

Chicago Midway International Airport (MDW)

Best time to go to Chicago

  • It's time to figure out your trip dates for your flight from Lambert-St. Louis International Airport to Chicago. August is the most popular month to visit Chicago. If you prefer a more relaxed vibe, go in February.

  • When booking your flight from Lambert-St. Louis International Airport to Chicago, think about the type of weather you enjoy. July is the warmest month in Chicago, with temperatures ranging from 15ºC to 29ºC.

  • Search for cheap flights from STL to Chicago in January if you like cooler conditions. Temperatures are at their lowest around then, ranging between -12ºC and 3ºC on average.

More about Chicago

  • Start your Chicago trip off on the right foot by choosing the ideal place to stay. As soon as you've booked your flight from Lambert-St. Louis International Airport to Chicago, browse our range of accommodation options including:

  • There are so many things to do and see in this city it can be hard to work out where to begin. Millennium Park, Art Institute of Chicago and LandShark Beer Garden at Navy Pier are leading attractions which should be on any good Chicago itinerary.

Complete your Chicago trip with a car rental

  • Select one of our car rentals in Chicago and see the sights in your own time. Easily compare rates in one place to find your perfect ride once you've booked your hotel and cheap flights from Lambert-St. Louis International Airport to Chicago.

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