65 € Cheap Flights from Chicago O'Hare International to St Louis

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Flight deals from Chicago O'Hare International to St Louis

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

Find the cheapest month to fly from Chicago O'Hare International to St Louis

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

Direct flights from Chicago O'Hare International to St Louis

Chicago O'Hare International to St Louis: Alternative routes

Compare routes from Chicago O'Hare International 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 found65 €
Cheapest month to flyDecember
Average flight time1 hr, 26 mins
Most popular airlineAmerican Airlines
Average flights per week532

Finding cheap flights from Chicago O'Hare International to St Louis: Frequently asked questions

The best price we found for a return flight from Chicago O'Hare International to St Louis is 65 €. 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 26 minutes is the average flight time from Chicago O'Hare International to St Louis.
American Airlines, Alaska Airlines and United fly direct from Chicago O'Hare International to St Louis.
As of September 2025, there are 532 flights per week flying from Chicago O'Hare International to St Louis.
The cheapest month to fly from Chicago O'Hare International to St Louis is usually December.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Chicago O'Hare International Airport to St Louis Airport on Thursday, 11 December 2025.
Yes – the average flight time is 1 hour and 26 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.
Currently, United offers the cheapest flight tickets to St Louis.

Travelling from O'Hare International Airport (ORD) to Lambert-St. Louis International Airport (STL): what you need to know

  • The average duration of a direct flight from O'Hare International Airport to Lambert-St. Louis International Airport is 1 hour 20 minutes.

  • Chicago and St Louis share the same timezone, UTC-5.

  • Choose from 120 weekly O'Hare International Airport to Lambert-St. Louis International Airport flights. The 07:59 departure with American Airlines is the earliest flight you can take. American Airlines operates the latest service of the day at 20:55.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are tried-and-true travel tips. Get to the airport on time to catch your ORD to STL flight.

  • Be prepared for longer queues in popular months like August. Arriving up to four hours ahead of international flights and two hours for a domestic departure is a good idea.

  • American Airlines is your gateway to exploring St Louis (and perhaps some other great parts of United States!). Check out the direct flights from O'Hare International Airport to Lambert-St. Louis International Airport offered by this popular airline.

  • American Airlines has the highest passenger demand on this route.

  • With 76.58% of services landing as planned, American Airlines is the most punctual carrier operating ORD to STL flights.

  • Consider adding a stopover when booking your ticket from O'Hare International Airport to Lambert-St. Louis International Airport. Simply deselect 'Direct flights only' to break up your trip, or even explore someplace new along the way. Here are some options between ORD and STL:

    • Kansas City International Airport

    • Detroit Metropolitan Wayne County Airport

    • Minneapolis-St. Paul International Airport

How to find the cheapest flights from O'Hare International Airport (ORD) to Lambert-St. Louis International Airport (STL)

  • The lowest price we've found for a one-way O'Hare International Airport to Lambert-St. Louis International Airport flight is 33 €. A round-trip ticket is currently 65 €. Depending on the availability when you book, these fares could change.

  • To pick up cheap tickets from ORD to STL, book your trip eight months before your planned departure.

  • The cheapest month for flights from O'Hare International Airport to Lambert-St. Louis International Airport is July. Use the 'Whole month' tool to find the lowest airfares if you have flexible dates.

  • Never miss a deal on cheap flights from ORD to STL by creating a Price Alert. You'll receive an email or push notification on the app when a lower fare pops up.

  • Tailor your trip using filters. Pick your departure and arrival times, airlines and total journey duration. You can also sort results by 'Cheapest,' 'Fastest' or 'Best' flights from O'Hare International Airport to Lambert-St. Louis International Airport.

Handy information about O'Hare International Airport (ORD)

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

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

  • To get to O'Hare International Airport from central Chicago, it takes around 35 minutes if you're planning to drive. Of course, this depends on traffic. It's approximately 40 kilometres from the airport to the city centre.

  • The trip on public transport takes roughly 55 minutes.

  • Booked an early flight from O'Hare International Airport to Lambert-St. Louis International Airport? Avoid the stress of rushing to the airport (and sneak in some extra snooze time) by picking one of these stays near ORD:

Arriving at Lambert-St. Louis International Airport (STL)

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

  • You'll find STL at 10701 Lambert International Blvd..

  • Lambert-St. Louis International Airport to central St Louis has a drive time of about 20 minutes. It's approximately 26 kilometres away.

  • Travelling to the centre by public transport takes about 35 minutes.

When to fly to Lambert-St. Louis International Airport (STL)

  • It's time to choose your dates for your flight from O'Hare International Airport to Lambert-St. Louis International Airport. July is the busiest month to head to St Louis. If you're after a more laid-back vibe, go in April.

  • Book your flight from O'Hare International Airport to Lambert-St. Louis International Airport for July if you'd like to visit St Louis during its warmest month. Expect temperatures of between 17ºC (63ºF) and 33ºC (91ºF).

  • Look for cheap tickets from ORD to STL in January if you like travelling in cooler conditions. Temperatures are at their lowest around then, ranging between -8ºC (18ºF) and 7ºC (45ºF) on average.

Explore more of United States

  • Chicago is just one of the many cities in United States waiting to be discovered once you've seen the sights of St Louis. Around 418 kilometres away to the north-east, its best attractions include Millennium Park, Art Institute of Chicago and LandShark Beer Garden at Navy Pier.

  • Indianapolis is another well-known destination in United States and is around 370 kilometres east of St Louis. No trip is complete without dropping by The Children's Museum of Indianapolis, Indianapolis Museum of Art and Indianapolis Zoo.

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