$177 Cheap Flights from Ponce (PSE) to St. Louis (STL)

View $177 flight on Thu, Jul 24, 2025Opens in a new window

Popular airlines from Ponce (PSE-Mercedita) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Ponce to St. Louis (PSE-STL)

Prices were available within the past 7 days and start at $177 for one-way flights and $198 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Jul 9 - Wed, Jul 16
PSE
Ponce
STL
St. Louis
$198 Roundtrip, found 2 days ago
$198
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Wed, Jul 9 from Ponce to St. Louis, returning Wed, Jul 16, priced at $198 found 2 days ago
Frontier Airlines
Sun, Jul 13 - Wed, Jul 16
PSE
Ponce
STL
St. Louis
$228 Roundtrip, found 2 days ago
$228
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Sun, Jul 13 from Ponce to St. Louis, returning Wed, Jul 16, priced at $228 found 2 days ago
Frontier Airlines
Wed, Jul 9 - Sat, Jul 12
PSE
Ponce
STL
St. Louis
$286 Roundtrip, found 1 day ago
$286
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Jul 9 from Ponce to St. Louis, returning Sat, Jul 12, priced at $286 found 1 day ago
Frontier Airlines
Wed, Jul 9 - Sun, Jul 27
PSE
Ponce
STL
St. Louis
$294 Roundtrip, found 1 day ago
$294
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Jul 9 from Ponce to St. Louis, returning Sun, Jul 27, priced at $294 found 1 day ago
Frontier Airlines
Wed, Jul 2 - Wed, Jul 23
PSE
Ponce
STL
St. Louis
$296 Roundtrip, found 2 days ago
$296
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Wed, Jul 2 from Ponce to St. Louis, returning Wed, Jul 23, priced at $296 found 2 days ago
Frontier Airlines
Sat, Jul 12 - Wed, Jul 16
PSE
Ponce
STL
St. Louis
$298 Roundtrip, found 2 days ago
$298
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Sat, Jul 12 from Ponce to St. Louis, returning Wed, Jul 16, priced at $298 found 2 days ago
Frontier Airlines
Thu, Aug 28 - Sun, Sep 14
PSE
Ponce
STL
St. Louis
$304 Roundtrip, found 2 days ago
$304
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Thu, Aug 28 from Ponce to St. Louis, returning Sun, Sep 14, priced at $304 found 2 days ago
Frontier Airlines
Wed, Jul 9 - Thu, Jul 10
PSE
Ponce
STL
St. Louis
$304 Roundtrip, found 1 day ago
$304
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Jul 9 from Ponce to St. Louis, returning Thu, Jul 10, priced at $304 found 1 day ago
Frontier Airlines
Wed, Jul 9 - Sun, Jul 13
PSE
Ponce
STL
St. Louis
$308 Roundtrip, found 2 days ago
$308
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Wed, Jul 9 from Ponce to St. Louis, returning Sun, Jul 13, priced at $308 found 2 days ago
Frontier Airlines
Sat, Jul 5 - Wed, Jul 23
PSE
Ponce
STL
St. Louis
$314 Roundtrip, found 2 days ago
$314
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Sat, Jul 5 from Ponce to St. Louis, returning Wed, Jul 23, priced at $314 found 2 days ago
Frontier Airlines
Sun, Jul 13 - Wed, Jul 16
PSE
Ponce
STL
St. Louis
$316 Roundtrip, found 1 day ago
$316
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sun, Jul 13 from Ponce to St. Louis, returning Wed, Jul 16, priced at $316 found 1 day ago
Frontier Airlines
Wed, Jul 9 - Sat, Jul 26
PSE
Ponce
STL
St. Louis
$324 Roundtrip, found 1 day ago
$324
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Jul 9 from Ponce to St. Louis, returning Sat, Jul 26, priced at $324 found 1 day ago
Frontier Airlines
Fri, Jul 11 - Wed, Jul 16
PSE
Ponce
STL
St. Louis
$328 Roundtrip, found 2 days ago
$328
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Fri, Jul 11 from Ponce to St. Louis, returning Wed, Jul 16, priced at $328 found 2 days ago
Frontier Airlines
Sun, Jul 13 - Wed, Jul 23
PSE
Ponce
STL
St. Louis
$334 Roundtrip, found 1 day ago
$334
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sun, Jul 13 from Ponce to St. Louis, returning Wed, Jul 23, priced at $334 found 1 day ago
Frontier Airlines
Wed, Jul 16 - Thu, Jul 17
PSE
Ponce
STL
St. Louis
$338 Roundtrip, found 3 days ago
$338
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Wed, Jul 16 from Ponce to St. Louis, returning Thu, Jul 17, priced at $338 found 3 days 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 $328
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $328
Flights from Ponce (PSE) to St. Louis (STL)
Origin airport
Mercedita
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
$198
Distance
2023 mi

Ponce to St. Louis Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Ponce 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 Ponce 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 Ponce to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $177 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 Ponce 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 Ponce 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 Mercedita Airport (PSE) to Lambert-St. Louis Intl. Airport (STL) cost?
Discover the latest flight deals from PSE 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 PSE to STL?
The cheapest flights from PSE 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 Mercedita Airport (PSE) to Lambert-St. Louis Intl. Airport (STL)?
You can't fly directly from Ponce (PSE-Mercedita) to Lambert-St. Louis Intl. Airport (STL). However, you'll find other airports offering nonstop flights. Board your plane at Luis Munoz Marin Intl. Airport (SJU) and fly straight to St. Louis without layovers.
What is the cheapest airline that flies from PSE to STL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from PSE to STL. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Mercedita Airport (PSE) to Lambert-St. Louis Intl. Airport (STL)?
There are no daily direct flights departing from Mercedita Airport (PSE) to Lambert-St. Louis Intl. Airport (STL). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be on your way before you know it.
What day of the week has the most flights from PSE to STL?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Mercedita Airport (PSE) to Lambert-St. Louis Intl. Airport (STL)?
To arrive at Lambert-St. Louis Intl. Airport (STL) on schedule, book a flight that takes off from Mercedita Airport (PSE) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Mercedita Airport (PSE) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your plane ticket from PSE to STL just before your trip is generally more expensive. But if you're flexible with your travel dates and times, you could snag a cheap last-minute fare.
Is it cheaper to book a PSE to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking a PSE to STL flight and hotel package with Expedia could lead to significant savings. Better still, managing everything in one place will take the hassle out of planning your trip. Simply pick your flights and select from our wide range of stays, then customize your trip with other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Mercedita Airport (PSE) to Lambert-St. Louis Intl. Airport (STL)?
In most instances, you're able to reschedule or cancel your PSE to STL flight. However, there may be additional fees, especially if you made your booking over 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you'd like more information, head to our Customer Service portal.

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*Available to One Key members.