$86 Cheap Flights from San Juan (SJU) to St. Louis (STL)

View $86 flight on Fri, Jul 25, 2025Opens in a new window

Popular airlines from Luis Munoz Marin Intl. Airport (SJU) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from San Juan to St. Louis (SJU-STL)

Prices were available within the past 7 days and start at $86 for one-way flights and $214 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Nov 4 - Tue, Nov 4
SJU
San Juan
STL
St. Louis
$214 Roundtrip, found 1 day ago
$214
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Nov 4 from San Juan to St. Louis, returning Tue, Nov 4, priced at $214 found 1 day ago
United
Thu, Sep 25 - Thu, Oct 2
SJU
San Juan
STL
St. Louis
$219 Roundtrip, found 14 hours ago
$219
Roundtrip
found 14 hours ago
Select United flight, departing Thu, Sep 25 from San Juan to St. Louis, returning Thu, Oct 2, priced at $219 found 14 hours ago
Southwest Airlines
Wed, Sep 10 - Sat, Sep 13
SJU
San Juan
STL
St. Louis
$219 Roundtrip, found 2 hours ago
$219
Roundtrip
found 2 hours ago
Select Southwest Airlines flight, departing Wed, Sep 10 from San Juan to St. Louis, returning Sat, Sep 13, priced at $219 found 2 hours ago
American Airlines
Wed, Sep 17 - Sat, Sep 20
SJU
San Juan
STL
St. Louis
$219 Roundtrip, found 2 hours ago
$219
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Wed, Sep 17 from San Juan to St. Louis, returning Sat, Sep 20, priced at $219 found 2 hours ago
American Airlines
Wed, Oct 8 - Tue, Oct 14
SJU
San Juan
STL
St. Louis
$221 Roundtrip, just found
$221
Roundtrip
just found
Select American Airlines flight, departing Wed, Oct 8 from San Juan to St. Louis, returning Tue, Oct 14, priced at $221 just found
American Airlines
Wed, Sep 17 - Sat, Sep 20
SJU
San Juan
STL
St. Louis
$222 Roundtrip, found 2 hours ago
$222
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Wed, Sep 17 from San Juan to St. Louis, returning Sat, Sep 20, priced at $222 found 2 hours ago
Southwest Airlines
Fri, Sep 26 - Fri, Oct 3
SJU
San Juan
STL
St. Louis
$225 Roundtrip, found 1 day ago
$225
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Fri, Sep 26 from San Juan to St. Louis, returning Fri, Oct 3, priced at $225 found 1 day ago
American Airlines
Mon, Oct 6 - Wed, Oct 15
SJU
San Juan
STL
St. Louis
$227 Roundtrip, found 2 hours ago
$227
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Mon, Oct 6 from San Juan to St. Louis, returning Wed, Oct 15, priced at $227 found 2 hours ago
Delta
Fri, Sep 12 - Tue, Sep 16
SJU
San Juan
STL
St. Louis
$228 Roundtrip, found 4 days ago
$228
Roundtrip
found 4 days ago
Select Delta flight, departing Fri, Sep 12 from San Juan to St. Louis, returning Tue, Sep 16, priced at $228 found 4 days ago
Spirit Airlines
Thu, Aug 7 - Tue, Aug 12
SJU
San Juan
STL
St. Louis
$234 Roundtrip, found 9 hours ago
$234
Roundtrip
found 9 hours ago
Select Spirit Airlines flight, departing Thu, Aug 7 from San Juan to St. Louis, returning Tue, Aug 12, priced at $234 found 9 hours ago

Find the cheapest month to fly from San Juan (SJU) to St. Louis (STL)

February is typically the cheapest month to fly

From $142 - $421 per traveler.

Graph displaying average flight prices per month

Flights from San Juan (SJU) to St. Louis (STL)
Origin airport
Luis Munoz Marin Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, United
Roundtrip price
$213
Distance
2024 mi

San Juan to St. Louis Flights

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

 

The best time to book a flight from San Juan to St. Louis

Sunday is one of the best days to book for cheap flights from San Juan 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 San Juan 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 San Juan to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $86 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 San Juan 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 San Juan 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 Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL) cost?
You can score cheap return flights from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL) starting at $586. Book a seat and start your adventure. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Southwest Airlines flight leaving SJU on July 12 2025 and touching down at STL. The price was last updated on July 1 2025 and has not changed since.
What is the cheapest month to fly from SJU to STL?
To score a cheap fare, check for nonstop flights from SJU to STL leaving in July. You can find a one-way Southwest Airlines flight for $263 leaving on July 12 2025. This price is based on the cheapest direct flight found on Expedia for this route in the next 330 days. The price was last updated on July 1 2025 and remains unchanged.
Which airlines fly direct from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL)?
You can fly nonstop from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL) on a Southwest Airlines flight.
What is the cheapest airline that flies from SJU to STL?
Travel from SJU to STL with Southwest Airlines. This carrier currently offers the cheapest one-way fare for this route, starting from $263. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from SJU on July 12 2025. Prices were last updated on July 1 2025 and have not changed since.
How many flights per day from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL)?
On average, you can take your pick of 1 direct flights taking off from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL) each week. If you can't see one that suits your schedule, think about hopping on a flight with a layover. Customize your search results on Expedia to include one or more stops and select the next best option.
What are the most popular departure times for flights from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL)?
The 12 PM departures from SJU to STL are the most sought after. They can also be more expensive. If you want to save on your fare, pick a less crowded time to fly.
What day of the week has the most flights from SJU to STL?
Fly on a Saturday if you're looking for the best selection of flights from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL).
What is the earliest flight from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL)?
Luis Munoz Marin Intl. Airport (SJU)'s first flight to Lambert-St. Louis Intl. Airport (STL) departs at approximately 12:40PM UTC-4. With a total travel time of 5h 5m, you'll arrive at around 3:45PM UTC-6.
How long does it take to fly from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL)?
Flights from SJU to STL have an average travel time of 5 hours and 5 minutes. The distance between the two airports is 2,000 mi.
What airline has the least delays from SJU to STL?
With 100% of flights generally arriving on schedule, Southwest Airlines has the best on-time performance for nonstop flights from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL). To monitor your flight status and get notified about any changes, head to the Expedia App.
What is the best time to fly from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL)?
Opt for a flight from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL) that leaves before 3 PM to reduce the likelihood of delays. Departures after this time are on average 22% more likely to be canceled.**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.
What airports do you fly into for St. Louis from Luis Munoz Marin Intl. Airport (SJU)?
If you've booked a direct flight from Luis Munoz Marin Intl. Airport (SJU) to St. Louis, Lambert-St. Louis Intl. Airport (STL) is the only airport you can touch down at.
Is it cheaper to buy a plane ticket from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute bookings from SJU to STL are usually more expensive. To lock in the lowest prices, start searching for flights well ahead of time. That being said, if you're flexible with your travel plans, it's possible to score a cheap ticket right before your journey.
Is it cheaper to book a SJU to STL flight and hotel package?
You can save money by booking a SJU to STL flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one place. After choosing your ideal accommodations and flights, consider adding extras including car rentals, activities and tours.
Can I cancel or change the date of my flight from Luis Munoz Marin Intl. Airport (SJU) to Lambert-St. Louis Intl. Airport (STL)?
It's usually possible to cancel or reschedule your SJU to STL flight. However, if the booking was made more than 24 hours ago, additional charges 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 details on our Customer Service portal.

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