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Cheap flight tickets from Chicago to St Louis

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Flight deals from Chicago to St Louis Airport

Looking for a cheap last-minute deal or the best return flight from Chicago to St Louis Airport? If you want to travel next month, return fares start from RM377. Find the lowest prices on one-way and return tickets right here.
St Louis.RM377 per passenger.Departing Wed, 3 Jun, returning Wed, 3 Jun.Return flight with United.Outbound direct flight with United departs from Chicago O'Hare International on Wed, 3 Jun, arriving in St Louis.Inbound direct flight with United departs from St Louis on Wed, 3 Jun, arriving in Chicago O'Hare International.Price includes taxes and charges.From RM377, select.
St Louis.RM377 per passenger.Departing Tue, 5 May, returning Tue, 19 May.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Chicago Midway on Tue, 5 May, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Tue, 19 May, arriving in Chicago Midway.Price includes taxes and charges.From RM377, select.
St Louis.RM377 per passenger.Departing Tue, 7 Apr, returning Tue, 7 Apr.Return flight with United.Outbound direct flight with United departs from Chicago O'Hare International on Tue, 7 Apr, arriving in St Louis.Inbound direct flight with United departs from St Louis on Tue, 7 Apr, arriving in Chicago O'Hare International.Price includes taxes and charges.From RM377, select.
St Louis.RM665 per passenger.Departing Sat, 25 Apr, returning Sat, 2 May.Return flight with American Airlines.Outbound direct flight with American Airlines departs from Chicago O'Hare International on Sat, 25 Apr, arriving in St Louis.Inbound direct flight with American Airlines departs from St Louis on Sat, 2 May, arriving in Chicago O'Hare International.Price includes taxes and charges.From RM665, select.
St Louis.RM844 per passenger.Departing Sun, 31 May, returning Wed, 3 Jun.Return flight with United.Outbound direct flight with United departs from Chicago O'Hare International on Sun, 31 May, arriving in St Louis.Inbound direct flight with United departs from St Louis on Wed, 3 Jun, arriving in Chicago O'Hare International.Price includes taxes and charges.From RM844, select.
St Louis.RM881 per passenger.Departing Thu, 26 Mar, returning Tue, 31 Mar.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Chicago O'Hare International on Thu, 26 Mar, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Tue, 31 Mar, arriving in Chicago O'Hare International.Price includes taxes and charges.From RM881, select.
St Louis.RM1,235 per passenger.Departing Fri, 31 Jul, returning Sun, 9 Aug.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Chicago Midway on Fri, 31 Jul, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sun, 9 Aug, arriving in Chicago Midway.Price includes taxes and charges.From RM1,235, select.
St Louis.RM1,268 per passenger.Departing Sat, 1 Aug, returning Sun, 9 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Chicago O'Hare International on Sat, 1 Aug, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 9 Aug, arriving in Chicago Midway.Price includes taxes and charges.From RM1,268, select.
St Louis.RM1,305 per passenger.Departing Wed, 23 Sep, returning Fri, 25 Sep.Return flight with United.Outbound direct flight with United departs from Chicago O'Hare International on Wed, 23 Sep, arriving in St Louis.Inbound direct flight with United departs from St Louis on Fri, 25 Sep, arriving in Chicago O'Hare International.Price includes taxes and charges.From RM1,305, select.
St Louis.RM1,327 per passenger.Departing Sat, 1 Aug, returning Sun, 9 Aug.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Chicago Midway on Sat, 1 Aug, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sun, 9 Aug, arriving in Chicago Midway.Price includes taxes and charges.From RM1,327, select.
St Louis.RM1,354 per passenger.Departing Wed, 1 Jul, returning Sun, 5 Jul.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Chicago Midway on Wed, 1 Jul, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sun, 5 Jul, arriving in Chicago Midway.Price includes taxes and charges.From RM1,354, select.
St Louis.RM1,381 per passenger.Departing Tue, 30 Jun, returning Tue, 7 Jul.Return flight with Delta.Outbound indirect flight with Delta, departs from Chicago O'Hare International on Tue, 30 Jun, arriving in St Louis.Inbound indirect flight with Delta, departs from St Louis on Tue, 7 Jul, arriving in Chicago O'Hare International.Price includes taxes and charges.From RM1,381, select.
St Louis.RM1,388 per passenger.Departing Tue, 29 Sep, returning Fri, 2 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Chicago O'Hare International on Tue, 29 Sep, arriving in St Louis.Inbound indirect flight with Southwest Airlines, departs from St Louis on Fri, 2 Oct, arriving in Chicago O'Hare International.Price includes taxes and charges.From RM1,388, select.
St Louis.RM1,546 per passenger.Departing Tue, 29 Sep, returning Fri, 2 Oct.Return flight with United.Outbound direct flight with United departs from Chicago O'Hare International on Tue, 29 Sep, arriving in St Louis.Inbound direct flight with United departs from St Louis on Fri, 2 Oct, arriving in Chicago O'Hare International.Price includes taxes and charges.From RM1,546, select.
St Louis.RM1,551 per passenger.Departing Tue, 30 Jun, returning Tue, 7 Jul.Return flight with United.Outbound direct flight with United departs from Chicago O'Hare International on Tue, 30 Jun, arriving in St Louis.Inbound direct flight with United departs from St Louis on Tue, 7 Jul, arriving in Chicago O'Hare International.Price includes taxes and charges.From RM1,551, select.
St Louis.RM1,700 per passenger.Departing Tue, 24 Mar, returning Fri, 27 Mar.Return flight with United.Outbound direct flight with United departs from Chicago O'Hare International on Tue, 24 Mar, arriving in St Louis.Inbound direct flight with United departs from St Louis on Fri, 27 Mar, arriving in Chicago O'Hare International.Price includes taxes and charges.From RM1,700, select.

Find the cheapest month to fly from Chicago to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Chicago to St Louis flights are currently cheapest in April.
Mar
from RM881
Apr
from RM377
May
from RM377
Jun
from RM377
Jul
from RM1,354
Aug
from RM1,268
Sep
from RM1,305
Oct
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Nov
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Dec
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Jan
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Feb
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Direct flights from Chicago to St Louis

Chicago to St Louis: Alternative routes

Compare routes from Chicago to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

St Louis

20km from central St Louis
ClosestCheapest
from RM377
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Belleville

32km from central St Louis
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Sparta Community

69km from central St Louis
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Chicago to St Louis: Flight information

The things to know before you go.
Cheapest flight foundRM377
Cheapest month to flyMay
Average flight time1 hr, 21 mins
Most popular airlineAmerican Airlines
Average flights per week780

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

The best price we found for a return flight from Chicago to St Louis is RM377. 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 20 minutes is the average flight time from Chicago to St Louis.
American Airlines, United and Alaska Airlines fly direct from Chicago to St Louis.
As of March 2026, there are 1,560 flights per week flying from Chicago to St Louis.
The cheapest month to fly from Chicago to St Louis is usually May.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Chicago to St Louis Airport on Tuesday, 5 May 2026.
Yes – the average flight time is 1 hour and 20 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 St Louis 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 St Louis is around 40 days in advance, so don’t leave your flight to the last minute.
The cheapest airline that flies to St Louis is Southwest Airlines .

Flying from Chicago to St Louis Lambert International Airport (STL): What you need to know

  • Start planning your holiday by checking out the most convenient place to catch your flight from Chicago to St Louis Lambert International Airport (STL). Explore the options for setting off from Chicago O'Hare International Airport (ORD) or Chicago Midway International Airport (MDW), the city's main airports.

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

  • St Louis (where St Louis Lambert International Airport is located) and Chicago share the UTC-6 timezone. You can plan your trip without factoring in timezone differences.

  • Chicago O'Hare International Airport (ORD) to St Louis Lambert International Airport (STL) is the most popular route. There are 92 direct weekly departures to pick from. If you prefer starting your day later, take the last flight with American Airlines at 10:34pm. Choose the first ORD to STL departure with American Airlines at 6:46am if getting there sooner works for you.

  • Give yourself plenty of time to get on your flight from Chicago to STL. As a general rule, turn up at least two hours before international departures and an hour ahead for domestic flights.

  • July is a busy travel month. If you're taking off then or during a major holiday like Thanksgiving, be there even earlier. Aim for at least two hours ahead for domestic flights and as much as four hours for international journeys.

Airports in Chicago

Chicago O'Hare International Airport (ORD)

  • Chicago O'Hare International Airport (ORD) will have you travelling directly to your destination. Nonstop flights from Chicago to St Louis Lambert International Airport (STL) can be booked from this terminal.

  • When jetting out of ORD, you can take a direct flight from Chicago to St Louis Lambert International Airport with United Airlines.

  • The airline with the highest booking numbers between ORD and STL is United.

  • American Airlines is the most punctual carrier on this route, with 69.82% of its services arriving as planned.

  • ORD is about 27 kilometres from central Chicago. If you're catching a taxi, ride-sharing or driving from the centre, it'll take you 30 minutes or so to get there, depending on the traffic. If you're using public transport, expect the trip time to be around 45 minutes.

  • Want a leisurely start to your trip? Stay near Chicago O'Hare International Airport. Whether you're catching an early flight from Chicago to St Louis Lambert International Airport or prefer not to feel hurried, these hotels are just the thing:

  • Of all flights departing from Chicago O'Hare International Airport, 70% arrive as scheduled at their destination.

  • ORD is located at 10000 West O'Hare.

Chicago Midway International Airport (MDW)

  • You can book a direct Chicago to St Louis Lambert International Airport (STL) plane ticket with departures from Chicago Midway International Airport (MDW). Work out whether leaving from MDW works best for your plans.

  • From MDW, direct flights from Chicago to STL are available with Southwest Airlines.

  • On the MDW to STL route, Southwest Airlines is the preferred choice of many.

  • Go with Southwest Airlines if punctuality is a priority. Its flights between Chicago Midway International Airport and St Louis Lambert International Airport touch down as scheduled 81.52% of the time.

  • You can get to MDW from the centre of Chicago in approximately 25 minutes by car, depending on traffic conditions. The journey on public transport will take roughly 30 minutes to travel the 16 kilometres or so.

  • Get a head start on your holiday with an extra night away from home. Before catching your Chicago to STL flight, stay in one of these hotels near Chicago Midway International Airport:

  • Chicago Midway International Airport has an on-time performance rate of 76%. This figure gives an insight into how often flights that leave from this airport reach their destination on time.

  • MDW is located at 5700 South Cicero.

Chicago Rockford International Airport (RFD)

  • From the centre of Chicago, RFD is around 145 kilometres away. It'll take you roughly 1 hour 40 minutes to arrive by car and 2 hours or so if you take public transport.

  • Sleep a little longer, move a little slower, and still make your Chicago to St Louis Lambert International Airport flight without having to rush. These hotels near Chicago Rockford International Airport make getting to the terminal a breeze if you're flying out first thing:

  • Airports have an on-time performance rating that monitors how often flights get to their destinations within the expected time frame. At RFD, that figure is 71%.

  • Chicago Rockford International Airport is located at 2 Airport Cir.

About St Louis Lambert International Airport (STL)

Getting from St Louis Lambert International Airport (STL) to central St Louis

  • From St Louis Lambert International Airport, central St Louis is around 24 kilometres away. It takes about 25 minutes to reach the city centre by car.

  • It takes roughly 30 minutes if you're using public transport.

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

  • At the moment, RM187 is the lowest price we've found for a one-way ticket from Chicago to St Louis Lambert International Airport. The cheapest price for a return flight is RM377. Remember fares may change due to demand at the time of booking.

  • Lock in cheap flights from Chicago to STL by booking two months ahead. According to our research, that's the ideal time frame for finding a bargain.

  • Organise your trip for July. That's the best month for scoring an awesome deal on Chicago to St Louis Lambert International Airport tickets. If your travel dates are flexible, use the 'Whole month' tool to find the lowest price across every month.

  • Locking in a cheap plane ticket from Chicago to STL couldn't be easier with Price Alerts. Simply create one of these automatic alerts and we'll let you know when there's a better deal.

  • Find the best deal on a flight from Chicago to St Louis Lambert International Airport with the help of the filters. Choose your ideal departure and arrival times, number of stops and airlines. You can also sort your results by 'Best,' 'Cheapest' or 'Fastest.'

The best time to fly from Chicago to St Louis Lambert International Airport (STL)

  • July is the busiest month for flights from Chicago to St Louis Lambert International Airport (STL). Visit St Louis in December for a more low-key escape.

  • The warmest month in St Louis is July, with temperatures ranging between 17ºC (63ºF) and 33ºC (91ºF). Lock in your Chicago to STL plane ticket then if this is the type of weather you enjoy.

  • Look for cheap tickets from Chicago to St Louis Lambert International Airport in January if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between -7ºC (19ºF) and 8ºC (46ºF).

More about St Louis

Explore more of the United States

  • Evansville is just one of the many places in the United States waiting to be discovered once you've seen St Louis. Around 257 kilometres away to the east, popular attractions include Mesker Park Zoo, Riverfront Park and Evansville Museum of Arts, History & Science.

  • If you're interested in discovering another well-known destination in the United States, consider Columbia, roughly 177 kilometres west of St Louis. Museum of Art and Archaeology, Mizzou Botanic Garden and Francis Quadrangle are highlights.

Plan the rest of your trip from Chicago to St Louis

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