Cheap Flights from Chicago (DPA) to St. Louis (STL)

Popular airlines from Chicago, IL (DPA-Dupage) to St. Louis Lambert Intl. Airport (STL)

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Flights from Chicago (DPA) to St. Louis (STL)
Origin airport
Dupage
Destination airport
Lambert-St. Louis Intl.
Distance
245 mi

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 . 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 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.

 

Frequently asked questions

How much does a flight from Dupage Airport (DPA) to Lambert-St. Louis Intl. Airport (STL) cost?
Discover the latest flight deals from DPA to STL by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from DPA to STL?
The cheapest flights from DPA to STL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Dupage Airport (DPA) to Lambert-St. Louis Intl. Airport (STL)?
While Chicago, IL (DPA-Dupage) doesn't offer any direct flights to Lambert-St. Louis Intl. Airport (STL), other airports have nonstop routes. Traveling from O'Hare Intl. Airport (ORD) will get you to St. Louis without any detours.
What is the cheapest airline that flies from DPA to STL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from DPA to STL. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Dupage Airport (DPA) to Lambert-St. Louis Intl. Airport (STL)?
You'll have to take a flight with a layover when traveling from Dupage Airport (DPA) to Lambert-St. Louis Intl. Airport (STL). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from DPA to STL?
Typically you'll find the widest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* However, this can change depending on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Dupage Airport (DPA) to Lambert-St. Louis Intl. Airport (STL)?
Opt for a flight from Dupage Airport (DPA) to Lambert-St. Louis Intl. Airport (STL) that leaves before 3 PM to reduce the risk of cancellations. Departures after this hour 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.
Is it cheaper to buy a plane ticket from Dupage Airport (DPA) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your plane ticket from DPA to STL right before your trip is generally more expensive. But if there's some wiggle room with your travel times and dates, you could bag a cheap last-minute fare.
Is it cheaper to book a DPA to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking a DPA to STL flight and hotel package with Expedia could result in significant savings. Better yet, managing everything in one place will take the hassle out of planning your trip. Simply secure your flights and choose from our extensive range of stays, then customize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Dupage Airport (DPA) to Lambert-St. Louis Intl. Airport (STL)?
If you booked your DPA to STL flight in the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

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*Available to One Key members.