Popular airlines from Chicago O'Hare Intl. Airport (ORD) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Chicago to St. Louis (ORD-STL)

Prices were available within the past 7 days and start at $49 for one-way flights and $91 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, Dec 6 - Tue, Dec 9
ORD
Chicago
STL
St. Louis
$91 Roundtrip, found 4 days ago
$91
Roundtrip
found 4 days ago
Select American Airlines flight, departing Sat, Dec 6 from Chicago to St. Louis, returning Tue, Dec 9, priced at $91 found 4 days ago
United
Wed, Feb 11 - Thu, Feb 19
ORD
Chicago
STL
St. Louis
$91 Roundtrip, found 4 days ago
$91
Roundtrip
found 4 days ago
Select United flight, departing Wed, Feb 11 from Chicago to St. Louis, returning Thu, Feb 19, priced at $91 found 4 days ago
American Airlines
Thu, Nov 27 - Wed, Dec 3
ORD
Chicago
STL
St. Louis
$96 Roundtrip, found 5 days ago
$96
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Nov 27 from Chicago to St. Louis, returning Wed, Dec 3, priced at $96 found 5 days ago
United
Thu, Nov 27 - Wed, Dec 3
ORD
Chicago
STL
St. Louis
$98 Roundtrip, found 5 days ago
$98
Roundtrip
found 5 days ago
Select United flight, departing Thu, Nov 27 from Chicago to St. Louis, returning Wed, Dec 3, priced at $98 found 5 days ago
United
Sat, Feb 14 - Wed, Feb 18
ORD
Chicago
STL
St. Louis
$101 Roundtrip, found 4 days ago
$101
Roundtrip
found 4 days ago
Select United flight, departing Sat, Feb 14 from Chicago to St. Louis, returning Wed, Feb 18, priced at $101 found 4 days ago
Southwest Airlines
Thu, Jan 15 - Sat, Jan 17
ORD
Chicago
STL
St. Louis
$109 Roundtrip, found 14 hours ago
$109
Roundtrip
found 14 hours ago
Select Southwest Airlines flight, departing Thu, Jan 15 from Chicago to St. Louis, returning Sat, Jan 17, priced at $109 found 14 hours ago
American Airlines
Thu, Dec 25 - Thu, Jan 1
ORD
Chicago
STL
St. Louis
$111 Roundtrip, found 6 days ago
$111
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, Dec 25 from Chicago to St. Louis, returning Thu, Jan 1, priced at $111 found 6 days ago
American Airlines
Thu, Feb 19 - Sun, Feb 22
ORD
Chicago
STL
St. Louis
$112 Roundtrip, found 5 days ago
$112
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Feb 19 from Chicago to St. Louis, returning Sun, Feb 22, priced at $112 found 5 days ago
Delta
Wed, Feb 11 - Thu, Feb 19
ORD
Chicago
STL
St. Louis
$124 Roundtrip, found 4 days ago
$124
Roundtrip
found 4 days ago
Select Delta flight, departing Wed, Feb 11 from Chicago to St. Louis, returning Thu, Feb 19, priced at $124 found 4 days ago
Frontier Airlines
Thu, Nov 20 - Mon, Nov 24
ORD
Chicago
STL
St. Louis
$131 Roundtrip, found 8 hours ago
$131
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Thu, Nov 20 from Chicago to St. Louis, returning Mon, Nov 24, priced at $131 found 8 hours ago

Find the cheapest month to fly from Chicago (ORD) to St. Louis (STL)

September is typically the cheapest month to fly

From $77 - $335 per traveler.

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $260
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $260

Frequently asked questions

How much does a flight from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL) cost?
Get a cheap one-way flight from $49 or cheap return flight from $91 from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL)?
Planning your getaway for December is a great way to save, as it's the cheapest month for flights between ORD and STL. You'll often find the lowest fares during off-peak months.
Which airlines fly direct from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL)?
When flying out of O'Hare Intl. Airport (ORD), you can board a nonstop flight to Lambert-St. Louis Intl. Airport (STL) with United Airlines.
What is the cheapest airline that flies from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL)?
American Airlines and United Airlines are some well-known airlines offering reasonable fares. Keep in mind that flight prices from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL) can vary depending on travel dates, demand and how early you book. With Expedia's filter tool, you can easily find a ORD to STL flight that works with your plans and budget.
How many flights per day from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL)?
When jetting out of O'Hare Intl. Airport (ORD), you can take your pick from an average of 11 daily nonstop flights to Lambert-St. Louis Intl. Airport (STL).
What are the most popular departure times for flights from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL)?
Flights between ORD and STL are busiest at 12 PM. If you'd like a quieter trip and potentially cheaper fares, look for a time outside the usual busy windows.
What day of the week has the most flights from ORD to STL?
Friday offers the most flights from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL). Consider taking off on this day and you'll have the best chance of finding a departure that works with your plans.
What is the earliest flight from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL)?
O'Hare Intl. Airport (ORD)'s earliest flight to Lambert-St. Louis Intl. Airport (STL) leaves at approximately 9:15AM UTC-6. With a flight time of 1h 39m, you'll touch down at around 10:54AM UTC-6.
How long does it take to fly from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL)?
Flights from ORD to STL have an average travel time of 1 hour and 30 minutes. The distance between the two is 260 mi.
What airline has the least delays from ORD to STL?
With 82% of flights generally arriving on schedule, Alaska Airlines has the best on-time performance for nonstop flights from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL). To keep track of your flight status and receive notifications about any changes, use the Expedia App.
What is the best time to fly from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL)?
Opt for a flight from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL) that leaves before 3 PM to reduce the risk of delays and cancellations. Later departures have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for St. Louis from O'Hare Intl. Airport (ORD)?
If you're flying on a direct flight from O'Hare Intl. Airport (ORD) to St. Louis, Lambert-St. Louis Intl. Airport (STL) is the only airport you can touch down at.
Is it cheaper to buy a plane ticket from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Holding off until just before your trip to book a flight from ORD to STL often results in higher prices. While you might find some last-minute discounts, there's no guarantee. Be flexible with your travel plans to maximize your chances of getting a bargain.
Is it cheaper to book an ORD to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking an ORD to STL flight and hotel package with Expedia could result in significant savings. Better still, having everything in one place takes the hassle out of travel planning. Just pick your flights and choose from our extensive range of stays, then customize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from O'Hare Intl. Airport (ORD) to Lambert-St. Louis Intl. Airport (STL)?
It's generally possible to reschedule or cancel your ORD to STL flight. However, for bookings made more than 24 hours ago, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Origin airport
O'Hare Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, Southern Airways Express, Southwest Airlines, United
Roundtrip price
$91
Distance
258 mi
Average flight time
1 hour 22 mins

Book with confidence

Chicago to St. Louis Flights

The cheapest times to fly from Chicago to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Chicago to St. Louis are during the month of December. You can find some of the cheapest flights from Chicago to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Chicago to St. Louis

Sunday is one of the best days to book for cheap flights from Chicago to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Chicago to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Chicago to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $49 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Chicago to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Chicago to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Chicago to St. Louis Flights

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*Available to One Key members.