Cheap Flights from Chicago to St Louis

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Flight deals from Chicago to St Louis

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

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 October.

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.

Chicago to St Louis: Flight information

The things to know before you go.
Cheapest flight foundRs12,768
Cheapest month to flyOctober
Average flight time1 hr, 21 mins
Most popular airlineAmerican Airlines
Average flights per week1,530

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 Rs25,536. 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, Southwest Airlines and United fly direct from Chicago to St Louis.
As of October 2025, there are 510 flights per week flying from Chicago to St Louis.
The cheapest month to fly from Chicago to St Louis is usually January.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Chicago to St Louis Airport on Saturday, 17 January 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 Lambert-St. Louis International Airport (STL): What you need to know

  • Start planning your trip by checking out the most convenient departure point for your flight from Chicago to Lambert-St. Louis International Airport (STL). Explore your options for taking off from O'Hare International Airport (ORD) or Chicago Midway International Airport (MDW), two of the city's main airports.

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

  • St Louis (where Lambert-St. Louis International Airport is located) and Chicago share the UTC-5 timezone. You can plan your trip without factoring in timezone differences.

  • With 89 direct weekly flights between the two airports, O'Hare International Airport (ORD) to Lambert-St. Louis International Airport (STL) is the busiest route. American Airlines operates the earliest flight at 6:46am. If you're eager to get more out of your day before leaving, the last flight from ORD to STL is with American Airlines at 10:34pm.

  • To ensure you catch your flight from Chicago to STL, leave enough time to navigate the airport and find your gate. Turning up two hours ahead of international departures and one hour before domestic flights is the general rule.

  • With more people on the move during peak seasons, it's wise to get to your terminal earlier than usual. Two hours for domestic flights and up to four for international trips will allow extra time for delays.

Airports in Chicago

O'Hare International Airport (ORD)

  • You can take a direct flight from Chicago to Lambert-St. Louis International Airport (STL) leaving from O'Hare International Airport (ORD).

  • You can lock in a direct flight from Chicago to Lambert-St. Louis International Airport with United Airlines. This leading airline offers services from ORD.

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

  • With 76.58% of services arriving as scheduled, American Airlines is the highest-rated carrier for punctuality on this route.

  • ORD is around 40 kilometres from central Chicago. If you're ride-sharing, driving or catching a cab from the centre, it'll take 35 minutes or so to get there, depending on traffic conditions. If you're using public transport, expect the trip time to be around 55 minutes.

  • Searching for a convenient hotel near O'Hare International Airport? If you're catching an early flight from Chicago to Lambert-St. Louis International Airport, these stays will have you sleeping a quick hop from check-in:

  • When it comes to the on-time performance of O'Hare International Airport, 74.85% of flights arrive within the expected time frame.

  • You'll find ORD at 10000 West O'Hare.

Chicago Midway International Airport (MDW)

  • Think about setting out from Chicago Midway International Airport (MDW). You can book a direct Chicago to Lambert-St. Louis International Airport (STL) flight ticket from this hub.

  • From MDW, direct flights from Chicago to STL are offered by Southwest Airlines.

  • On the MDW to STL route, Southwest Airlines is the go-to airline for most travellers.

  • Choose Southwest Airlines if punctual service is a priority. Its flights between Chicago Midway International Airport and Lambert-St. Louis International Airport land as scheduled 81.4% of the time.

  • MDW is about 19 kilometres from central Chicago. It'll take you 20 minutes or so to get to the airport driving from the city centre. Public transport takes roughly 45 minutes.

  • Want to enjoy an extra night away before catching your Chicago to STL flight? Unwind in a hotel near Chicago Midway International Airport before your trip officially starts. These stays are calling your name:

  • 77.88% of flights departing Chicago Midway International Airport make it to their destination as expected.

  • You'll find MDW at 5700 South Cicero.

Chicago Rockford International Airport (RFD)

  • The journey to RFD from central Chicago is around 4 hours 15 minutes on public transport. If you're going by car, it'll take you roughly 1 hour 25 minutes to cover the 137 kilometres or so.

  • Set yourself up for a smooth departure — stay close to Chicago Rockford International Airport and know you'll be at your boarding gate with time to spare. Get settled at one of these hotels the day before if you've booked an early Chicago to Lambert-St. Louis International Airport flight:

  • The on-time performance rating of RFD is 76.19%. To put it simply, that's how frequently flights from this airport reach their final stop as planned.

  • The street address of Chicago Rockford International Airport is 2 Airport Cir.

About Lambert-St. Louis International Airport (STL)

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

  • Central St Louis is roughly 16 kilometres from Lambert-St. Louis International Airport. Travel times by car hire or cab will vary depending on traffic conditions and time of day, so do a little research ahead of your trip.

  • It typically takes 35 minutes if you're travelling by public transport.

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

  • Rs12,768 is the lowest price for a one-way ticket from Chicago to Lambert-St. Louis International Airport. Return flights start from Rs25,536. These fares may change based on availability and demand.

  • Snap up cheap flights from Chicago to STL by booking two months ahead. According to our research, that's the ideal time frame for finding the biggest deals.

  • Schedule your trip for July. That's the best month for landing the biggest deals on Chicago to Lambert-St. Louis International Airport tickets. If you're flexible with your dates, use the 'Whole month' tool to find the cheapest price across each month.

  • Stay on top of deals for flight tickets from Chicago to STL by setting up a Price Alert. We'll send you an email or push notification on the app when a lower fare becomes available.

  • Nail down a great price on a flight from Chicago to Lambert-St. Louis International Airport with the help of the filters. Choose your preferred arrival and departure times, airlines and number of stops. You can also sort your results by 'Cheapest,' 'Fastest' or 'Best.'

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

  • It's time to figure out when to book your flight from Chicago to Lambert-St. Louis International Airport (STL). July is the busiest month to visit St Louis. If you like your getaways a little more chill, go in April.

  • The warmest month in St Louis is July, with temperatures ranging between 17ºC and 33ºC. Book your Chicago to STL flight ticket then if that's your idea of comfortable weather.

  • Search for cheap tickets from Chicago to Lambert-St. Louis International Airport in January if you like travelling in cooler conditions. Temperatures are at their lowest then, ranging between -8ºC and 7ºC.

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 explored once you've seen St Louis. Around 257 kilometres away to the east, check out popular attractions including Mesker Park Zoo, Riverfront Park and Evansville Zoological Society.

  • Around 177 kilometres west of St Louis, Columbia is another essential stop in the United States. Start your sightseeing at Sentinel Park, Museum of Art and Archaeology and Bur Oak Brewing Company.

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