Cheap Flights from St Louis to Chicago O'Hare International

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Flight deals from St Louis to Chicago O'Hare International

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

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

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

Direct flights from St Louis to Chicago O'Hare International

St Louis to Chicago O'Hare International: Alternative routes

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

St Louis to Chicago: Flight information

The things to know before you go.
Cheapest flight foundRs13,592
Cheapest month to flyMay
Average flight time1 hr, 26 mins
Most popular airlineAlaska Airlines
Average flights per week653

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

The best price we found for a return flight from St Louis to Chicago O'Hare International is Rs27,191. 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 St Louis to Chicago O'Hare International.
Alaska Airlines, American Airlines and Qatar Airways fly direct from St Louis to Chicago O'Hare International.
As of April 2025, there are 653 flights per week flying from St Louis to Chicago O'Hare International.
The cheapest month to fly from St Louis to Chicago O'Hare International is usually April 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Chicago O'Hare International Airport on Monday, 9 June 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 Chicago O'Hare International 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.
Currently, United offers the cheapest flight tickets to Chicago O'Hare International.

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

  • Jump on a direct flight from Lambert-St. Louis International Airport to O'Hare International Airport and you'll be travelling for an average of 1 hour 25 minutes.

  • Chicago's timezone is UTC-5, which is the same as St Louis.

  • Choose from 117 weekly Lambert-St. Louis International Airport to O'Hare International Airport flights. The 06:00 departure with American Airlines is the earliest flight available. American Airlines operates the last service of the day at 18:27.

  • For a smooth journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. This way, you can comfortably catch your STL to ORD flight.

  • Flying during a peak time like July? School holidays and other high seasons can lead to longer queues at security. Be extra cautious and get there up to four hours ahead of international flights and two hours before a domestic departure.

  • American Airlines is your ticket to exploring Chicago (and maybe even some other great corners of United States!). Browse the direct flights from Lambert-St. Louis International Airport to O'Hare International Airport offered by this popular carrier.

  • American Airlines is the top choice for travellers on this route.

  • The most punctual carrier operating STL to ORD flights is United Airlines. Its services arrive without delay 74.16% of the time.

  • We make it easy to book a flight with a stopover. To see all your options for tickets from Lambert-St. Louis International Airport to O'Hare International Airport, deselect 'Direct flights only.' Then, choose a flight offering a stop long enough to explore your chosen city. Popular stopovers between STL and ORD include:

    • General Mitchell International Airport

    • Kansas City International Airport

    • Detroit Metropolitan Wayne County Airport

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

  • The lowest price we've seen for a one-way Lambert-St. Louis International Airport to O'Hare International Airport flight is Rs13,592. A round-trip ticket is currently Rs27,191. Depending on the availability and when you book, these fares may change.

  • Score cheap tickets from STL to ORD by booking nine months ahead. Based on our research, that's the sweet spot for finding the biggest deals.

  • Plan your trip for August. That's the cheapest month for flights from Lambert-St. Louis International Airport to O'Hare International Airport. If you're flexible with your travel dates, use the 'Whole month' tool to see the lowest price across every month.

  • You don't need to check back in every day to find out if fares have gone down when you create a Price Alert. We'll notify you as soon as there's a better deal on cheap flights from STL to ORD.

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

Handy information about Lambert-St. Louis International Airport (STL)

Arriving at O'Hare International Airport (ORD)

Getting from O'Hare International Airport (ORD) to central Chicago

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

  • O'Hare International Airport is approximately 40 kilometres from central Chicago. The drive time takes about 35 minutes.

  • Travelling by public transport takes about 55 minutes.

When to fly to O'Hare International Airport (ORD)

  • The quietest month for a flight from Lambert-St. Louis International Airport to O'Hare International Airport is January, while August is the busiest. Choose the ideal time to go to Chicago based on whether you prefer a faster pace or a more relaxed vibe.

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

  • If you like cooler conditions, search for a cheap ticket from STL to ORD in January. Average temperatures are between -12ºC and 3ºC then.

Explore more of United States

  • Chicago is easy to fall in love with, but there are so many other corners of United States you'll want to see. About 451 kilometres south-east of Chicago, a visit to Columbus will keep you on the go. Start with attractions like Franklin Park Conservatory and Botanical Gardens, Ohio Statehouse and German Village.

  • Indianapolis is another favourite destination in United States and is around 257 kilometres south-east of Chicago. No trip is complete without a visit to 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.