$98 Cheap Flights from St. Louis (STL) to Ponce (PSE)

View $98 flight on Thu, Apr 23, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $98 for one-way flights and $221 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Apr 30 - Mon, May 4
STL
St. Louis
PSE
Ponce
$221 Roundtrip, found 19 hours ago
$221
Roundtrip
found 19 hours ago
Select Frontier Airlines flight, departing Thu, Apr 30 from St. Louis to Ponce, returning Mon, May 4, priced at $221 found 19 hours ago
Frontier Airlines
Sun, Apr 26 - Mon, May 4
STL
St. Louis
PSE
Ponce
$226 Roundtrip, found 1 day ago
$226
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sun, Apr 26 from St. Louis to Ponce, returning Mon, May 4, priced at $226 found 1 day ago
Frontier Airlines
Thu, Apr 23 - Mon, Apr 27
STL
St. Louis
PSE
Ponce
$344 Roundtrip, found 1 day ago
$344
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Apr 23 from St. Louis to Ponce, returning Mon, Apr 27, priced at $344 found 1 day ago
Frontier Airlines
Thu, Apr 23 - Mon, Apr 27
STL
St. Louis
PSE
Ponce
$383 Roundtrip, found 1 day ago
$383
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Apr 23 from St. Louis to Ponce, returning Mon, Apr 27, priced at $383 found 1 day ago
Frontier Airlines
Thu, Apr 23 - Mon, Apr 27
STL
St. Louis
PSE
Ponce
$399 Roundtrip, found 1 day ago
$399
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Apr 23 from St. Louis to Ponce, returning Mon, Apr 27, priced at $399 found 1 day ago
Frontier Airlines
Thu, Apr 23 - Mon, Apr 27
STL
St. Louis
PSE
Ponce
$438 Roundtrip, found 1 day ago
$438
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Apr 23 from St. Louis to Ponce, returning Mon, Apr 27, priced at $438 found 1 day ago

Frequently asked questions

How much does a flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita) cost?
You can find cheap one-way flights from $98 and cheap return flights from $221 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita) with Expedia. Return flights often range between $406 and $831. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita)?
The cheapest month to fly from STL to PSE is April when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita)?
Enter STL to PSE and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita)?
Frontier Airlines is one of the cheapest airlines offering connecting flights from Lambert-St. Louis Intl. (STL) to Mercedita (PSE), with round-trip tickets starting from around $406. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita)?
To find a cheap flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita)?
The earliest flight from St. Louis, MO (STL) to Ponce (PSE) typically departs at around 7:50 AM local time, operated by Frontier Airlines. This is a seasonal service active in March, and an early departure allows you to maximize your time in Ponce. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita)?
The busiest day for flights from Lambert-St. Louis Intl. (STL) to Mercedita (PSE) is a Saturday, with around 2 flights. This gives you plenty of options for your travel plans. A major airline on this route is Frontier Airlines.
What are the most popular departure times for flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita)?
The most popular departure times for flights from St. Louis, MO (STL) to Ponce (PSE) are in the late afternoon, from 3pm to 6pm. About 67% of passengers prefer this time window. Frontier Airlines offers flights during this window. Many travelers choose this timing because it allows for a relaxed morning before heading to the airport.
How long does it take to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita)?
Flights from STL to PSE with one stop typically take around 17 hours 20 minutes, covering approximately 2,024 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita)?
Select the "Business class" and "First class" filters when looking for STL to PSE flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita) flight with Expedia?
It's easy to earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Ponce from Lambert-St. Louis Intl. (STL)?
If you're planning to travel to Ponce from Lambert-St. Louis Intl. (STL), you can fly into Mercedita (PSE) Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita) at the last minute?
Typically, booking a last minute flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita) flight and hotel package?
Securing a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita)?
If you booked your St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ponce (PSE-Mercedita) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, 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.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Mercedita
Airlines serving
Frontier Airlines
Roundtrip price
$221
Distance
2023 mi

*Flight schedules are subject to change.

*Available to One Key members.