$126 Cheap Flights from Peoria (PIA) to St. Louis (STL)

View $126 flight on Sat, Nov 22, 2025Opens in a new window

Popular airlines from Peoria, IL (PIA-Greater Peoria Regional) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Peoria to St. Louis (PIA-STL)

Prices were available within the past 7 days and start at $126 for one-way flights and $219 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Fri, Dec 5 - Mon, Dec 8
PIA
Peoria
STL
St. Louis
$219 Roundtrip, found 22 hours ago
$219
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Fri, Dec 5 from Peoria to St. Louis, returning Mon, Dec 8, priced at $219 found 22 hours ago
American Airlines
Sat, Nov 8 - Tue, Nov 11
PIA
Peoria
STL
St. Louis
$224 Roundtrip, found 1 day ago
$224
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, Nov 8 from Peoria to St. Louis, returning Tue, Nov 11, priced at $224 found 1 day ago
American Airlines
Fri, Dec 5 - Mon, Dec 8
PIA
Peoria
STL
St. Louis
$234 Roundtrip, found 22 hours ago
$234
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Fri, Dec 5 from Peoria to St. Louis, returning Mon, Dec 8, priced at $234 found 22 hours ago
United
Fri, Dec 5 - Mon, Dec 8
PIA
Peoria
STL
St. Louis
$235 Roundtrip, found 22 hours ago
$235
Roundtrip
found 22 hours ago
Select United flight, departing Fri, Dec 5 from Peoria to St. Louis, returning Mon, Dec 8, priced at $235 found 22 hours ago
United
Fri, Dec 5 - Mon, Dec 8
PIA
Peoria
STL
St. Louis
$239 Roundtrip, found 22 hours ago
$239
Roundtrip
found 22 hours ago
Select United flight, departing Fri, Dec 5 from Peoria to St. Louis, returning Mon, Dec 8, priced at $239 found 22 hours ago
American Airlines
Fri, Dec 5 - Mon, Dec 8
PIA
Peoria
STL
St. Louis
$249 Roundtrip, found 22 hours ago
$249
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Fri, Dec 5 from Peoria to St. Louis, returning Mon, Dec 8, priced at $249 found 22 hours ago
American Airlines
Tue, Dec 2 - Wed, Dec 3
PIA
Peoria
STL
St. Louis
$251 Roundtrip, found 1 day ago
$251
Roundtrip
found 1 day ago
Select American Airlines flight, departing Tue, Dec 2 from Peoria to St. Louis, returning Wed, Dec 3, priced at $251 found 1 day ago
United
Fri, Dec 5 - Mon, Dec 8
PIA
Peoria
STL
St. Louis
$259 Roundtrip, found 22 hours ago
$259
Roundtrip
found 22 hours ago
Select United flight, departing Fri, Dec 5 from Peoria to St. Louis, returning Mon, Dec 8, priced at $259 found 22 hours ago
United
Fri, Dec 5 - Mon, Dec 8
PIA
Peoria
STL
St. Louis
$263 Roundtrip, found 22 hours ago
$263
Roundtrip
found 22 hours ago
Select United flight, departing Fri, Dec 5 from Peoria to St. Louis, returning Mon, Dec 8, priced at $263 found 22 hours ago
United
Tue, Dec 2 - Wed, Dec 3
PIA
Peoria
STL
St. Louis
$268 Roundtrip, found 1 day ago
$268
Roundtrip
found 1 day ago
Select United flight, departing Tue, Dec 2 from Peoria to St. Louis, returning Wed, Dec 3, priced at $268 found 1 day ago

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 $284
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $284

Frequently asked questions

How much does a flight from Greater Peoria Regional Airport (PIA) to Lambert-St. Louis Intl. Airport (STL) cost?
Grab a cheap one-way flight from $126 or cheap return flight from $219 from Greater Peoria Regional Airport (PIA) 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 Greater Peoria Regional Airport (PIA) to Lambert-St. Louis Intl. Airport (STL)?
December is the most affordable month to fly from PIA to STL. Traveling outside of peak seasons is often the key to better flight prices.
What is the cheapest airline that flies from Greater Peoria Regional Airport (PIA) to Lambert-St. Louis Intl. Airport (STL)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll take you from PIA to STL. Then, sort your results by "Price (lowest to highest)" to snag the best deal available.
How many flights per day from Greater Peoria Regional Airport (PIA) to Lambert-St. Louis Intl. Airport (STL)?
There aren't any daily direct flights departing from Greater Peoria Regional Airport (PIA) to Lambert-St. Louis Intl. Airport (STL). But you can choose flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be soaring above the clouds in no time.
What day of the week has the most flights from PIA to STL?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Just remember that flight schedules can change based on a number of factors, including the season and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Greater Peoria Regional Airport (PIA) to Lambert-St. Louis Intl. Airport (STL)?
To touch down at Lambert-St. Louis Intl. Airport (STL) on time, pick a flight that leaves Greater Peoria Regional Airport (PIA) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 Greater Peoria Regional Airport (PIA) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute bookings from PIA to STL are generally more expensive. To lock in the cheapest rates, start looking for flights ahead of time. That being said, if you're flexible with your travel plans, you may find a cheap fare right before your journey.
Is it cheaper to book a PIA to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking a PIA to STL flight and hotel package with Expedia could result in significant savings. Better yet, having everything in one place will take the stress out of planning your trip. Just pick your flights and select from our wide range of hotels, then tailor your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Greater Peoria Regional Airport (PIA) to Lambert-St. Louis Intl. Airport (STL)?
If you reserved your PIA to STL flight within the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you want more information.

Travel information

Origin airport
Greater Peoria Regional
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, United
Roundtrip price
$218
Distance
137 mi

Book with confidence

Peoria to St. Louis Flights

The cheapest times to fly from Peoria 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 Peoria to St. Louis are during the month of December. You can find some of the cheapest flights from Peoria to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Peoria 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 Peoria 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 Peoria to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $126 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 Peoria 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 Peoria 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.

 

Peoria to St. Louis Flights

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*Available to One Key members.