$100 Cheap Flights from White Plains (HPN) to St. Louis (STL)

View $100 flight on Tue, Jul 1, 2025Opens in a new window

Popular airlines from Westchester County Airport (HPN) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from White Plains to St. Louis (HPN-STL)

Prices were available within the past 7 days and start at $100 for one-way flights and $220 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Fri, Jul 4 - Tue, Jul 8
HPN
White Plains
STL
St. Louis
$220 Roundtrip, just found
$220
Roundtrip
just found
Select American Airlines flight, departing Fri, Jul 4 from White Plains to St. Louis, returning Tue, Jul 8, priced at $220 just found
American Airlines
Tue, Jul 1 - Sat, Jul 5
HPN
White Plains
STL
St. Louis
$221 Roundtrip, just found
$221
Roundtrip
just found
Select American Airlines flight, departing Tue, Jul 1 from White Plains to St. Louis, returning Sat, Jul 5, priced at $221 just found
American Airlines
Fri, Jul 4 - Tue, Jul 8
HPN
White Plains
STL
St. Louis
$223 Roundtrip, just found
$223
Roundtrip
just found
Select American Airlines flight, departing Fri, Jul 4 from White Plains to St. Louis, returning Tue, Jul 8, priced at $223 just found
Delta
Fri, Jul 4 - Sat, Jul 5
HPN
White Plains
STL
St. Louis
$237 Roundtrip, just found
$237
Roundtrip
just found
Select Delta flight, departing Fri, Jul 4 from White Plains to St. Louis, returning Sat, Jul 5, priced at $237 just found
Delta
Fri, Jul 4 - Tue, Jul 8
HPN
White Plains
STL
St. Louis
$239 Roundtrip, just found
$239
Roundtrip
just found
Select Delta flight, departing Fri, Jul 4 from White Plains to St. Louis, returning Tue, Jul 8, priced at $239 just found
American Airlines
Tue, Jul 1 - Sat, Jul 5
HPN
White Plains
STL
St. Louis
$240 Roundtrip, just found
$240
Roundtrip
just found
Select American Airlines flight, departing Tue, Jul 1 from White Plains to St. Louis, returning Sat, Jul 5, priced at $240 just found
Delta
Tue, Sep 23 - Tue, Oct 7
HPN
White Plains
STL
St. Louis
$241 Roundtrip, found 2 hours ago
$241
Roundtrip
found 2 hours ago
Select Delta flight, departing Tue, Sep 23 from White Plains to St. Louis, returning Tue, Oct 7, priced at $241 found 2 hours ago
Delta
Fri, Jul 4 - Tue, Jul 8
HPN
White Plains
STL
St. Louis
$242 Roundtrip, just found
$242
Roundtrip
just found
Select Delta flight, departing Fri, Jul 4 from White Plains to St. Louis, returning Tue, Jul 8, priced at $242 just found
Delta
Fri, Aug 29 - Sun, Aug 31
HPN
White Plains
STL
St. Louis
$243 Roundtrip, found 22 hours ago
$243
Roundtrip
found 22 hours ago
Select Delta flight, departing Fri, Aug 29 from White Plains to St. Louis, returning Sun, Aug 31, priced at $243 found 22 hours ago
Delta
Tue, Aug 12 - Wed, Aug 13
HPN
White Plains
STL
St. Louis
$244 Roundtrip, found 5 hours ago
$244
Roundtrip
found 5 hours ago
Select Delta flight, departing Tue, Aug 12 from White Plains to St. Louis, returning Wed, Aug 13, priced at $244 found 5 hours ago
Flights from White Plains (HPN) to St. Louis (STL)
Origin airport
Westchester County
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta
Roundtrip price
$219
Distance
896 mi

White Plains to St. Louis Flights

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

 

The best time to book a flight from White Plains to St. Louis

Sunday is one of the best days to book for cheap flights from White Plains 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 White Plains 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 White Plains to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $100 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 White Plains 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 White Plains 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 Westchester County Airport (HPN) to Lambert-St. Louis Intl. Airport (STL) cost?
Discover the latest flight deals from HPN 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 HPN to STL?
The cheapest flights from HPN 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.
What is the cheapest airline that flies from HPN to STL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from HPN to STL. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Westchester County Airport (HPN) to Lambert-St. Louis Intl. Airport (STL)?
You’ll have to take a flight with a layover if you’re traveling from Westchester County Airport (HPN) to Lambert-St. Louis Intl. Airport (STL). Direct flights don’t operate daily on this route. However, simply 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 HPN to STL?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can change depending on a range 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 Westchester County Airport (HPN) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the Westchester County Airport (HPN) to Lambert-St. Louis Intl. Airport (STL) route, aim to travel before 3 PM. Departures after this hour have a 22% higher chance of cancellation.**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 Westchester County Airport (HPN) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Holding off until just before your departure to book a flight from HPN to STL often results in higher prices. While you may come across some last-minute discounts, they aren’t always guaranteed. Be flexible with your itinerary to boost your chances of getting a bargain.
Is it cheaper to book a HPN to STL flight and hotel package?
Opting for a HPN to STL flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Choose from our wide range of accommodations and then add flights, car rentals and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Westchester County Airport (HPN) to Lambert-St. Louis Intl. Airport (STL)?
Typically, it’s possible to reschedule or cancel your HPN to STL flight. However, if it’s been more than 24 hours since booking, additional fees may apply. Check your airline’s policies in your itinerary to see what changes are allowed and if any costs are involved. You’ll also find more information on our Customer Service portal.

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*Available to One Key members.