$49 Cheap Flights from St. Thomas (STT) to San Juan (SJU)

View $49 flight on Wed, Aug 27, 2025Opens in a new window

Popular airlines from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU)

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Cheap Flights from St. Thomas to San Juan (STT-SJU)

Prices were available within the past 7 days and start at $49 for one-way flights and $97 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

JetBlue Airways
Tue, Aug 26 - Wed, Aug 27
STT
St. Thomas
SJU
San Juan
$97 Roundtrip, just found
$97
Roundtrip
just found
Select JetBlue Airways flight, departing Tue, Aug 26 from St. Thomas to San Juan, returning Wed, Aug 27, priced at $97 just found
JetBlue Airways
Sun, Aug 17 - Mon, Aug 18
STT
St. Thomas
SJU
San Juan
$103 Roundtrip, just found
$103
Roundtrip
just found
Select JetBlue Airways flight, departing Sun, Aug 17 from St. Thomas to San Juan, returning Mon, Aug 18, priced at $103 just found
Frontier Airlines
Mon, Aug 18 - Wed, Aug 27
STT
St. Thomas
SJU
San Juan
$103 Roundtrip, found 7 hours ago
$103
Roundtrip
found 7 hours ago
Select Frontier Airlines flight, departing Mon, Aug 18 from St. Thomas to San Juan, returning Wed, Aug 27, priced at $103 found 7 hours ago
Frontier Airlines
Fri, Aug 15 - Tue, Aug 19
STT
St. Thomas
SJU
San Juan
$104 Roundtrip, found 1 hour ago
$104
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Fri, Aug 15 from St. Thomas to San Juan, returning Tue, Aug 19, priced at $104 found 1 hour ago
Frontier Airlines
Mon, Aug 11 - Thu, Aug 21
STT
St. Thomas
SJU
San Juan
$108 Roundtrip, found 5 hours ago
$108
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Mon, Aug 11 from St. Thomas to San Juan, returning Thu, Aug 21, priced at $108 found 5 hours ago
Frontier Airlines
Fri, Aug 15 - Mon, Aug 18
STT
St. Thomas
SJU
San Juan
$109 Roundtrip, found 2 hours ago
$109
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Fri, Aug 15 from St. Thomas to San Juan, returning Mon, Aug 18, priced at $109 found 2 hours ago
Frontier Airlines
Mon, Aug 4 - Mon, Aug 18
STT
St. Thomas
SJU
San Juan
$111 Roundtrip, found 1 day ago
$111
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Mon, Aug 4 from St. Thomas to San Juan, returning Mon, Aug 18, priced at $111 found 1 day ago
Cape Air
Wed, Aug 27 - Thu, Aug 28
STT
St. Thomas
SJU
San Juan
$238 Roundtrip, just found
$238
Roundtrip
just found
Select Cape Air flight, departing Wed, Aug 27 from St. Thomas to San Juan, returning Thu, Aug 28, priced at $238 just found
Spirit Airlines
Sun, Aug 31 - Fri, Sep 5
STT
St. Thomas
SJU
San Juan
$277 Roundtrip, found 16 hours ago
$277
Roundtrip
found 16 hours ago
Select Spirit Airlines flight, departing Sun, Aug 31 from St. Thomas to San Juan, returning Fri, Sep 5, priced at $277 found 16 hours ago
American Airlines
Thu, Jul 31 - Thu, Aug 7
STT
St. Thomas
SJU
San Juan
$1,651 Roundtrip, found 10 hours ago
$1,651
Roundtrip
found 10 hours ago
Select American Airlines flight, departing Thu, Jul 31 from St. Thomas to San Juan, returning Thu, Aug 7, priced at $1,651 found 10 hours ago

Find the cheapest month to fly from St. Thomas (STT) to San Juan (SJU)

March is typically the cheapest month to fly

From $48 - $208 per traveler.

Graph displaying average flight prices per month

Alternative airports near San Juan

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Luis Munoz Marin Intl. SJU. Cheapest option available. Average driving time to city center is 16 minutes. Flights from $198
SJU
Luis Munoz Marin Intl.
Cheapest
Average driving time to city center16 min
Flights from $198
0
Flights from St. Thomas (STT) to San Juan (SJU)
Origin airport
Cyril E. King
Destination airport
Luis Munoz Marin Intl.
Airlines serving
American Airlines, Cape Air, Frontier Airlines, JetBlue Airways, Spirit Airlines
Roundtrip price
$96
Distance
68 mi

St. Thomas to San Juan Flights

The cheapest times to fly from St. Thomas to San Juan

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 St. Thomas to San Juan are during the month of August. You can find some of the cheapest flights from St. Thomas to San Juan with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from St. Thomas to San Juan: 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 St. Thomas to San Juan

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 St. Thomas to San Juan in 2025. You can also book with separate airlines for your outbound and return journeys, from $49 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 St. Thomas to San Juan 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 St. Thomas to San Juan 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 Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU) cost?
You can score cheap return flights from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU) starting at $88. Book a seat and take off on your trip. 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 Frontier Airlines flight leaving STT on August 11 2025 and touching down at SJU. The price was last updated on July 23 2025 and has not changed since.
What is the cheapest month to fly from STT to SJU?
The cheapest flights from STT to SJU 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 Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU)?
When departing from Cyril E. King Airport (STT), 5 airlines can take you directly to Luis Munoz Marin Intl. Airport (SJU) without any stopovers, including:

  • Cape Air
  • Silver Airways
  • JetBlue Airways
  • Sun Country Airlines
  • Frontier Airlines

What is the cheapest airline that flies from STT to SJU?
Right now, the cheapest carrier operating one-way flights from STT to SJU is Frontier Airlines. You can book a seat on this route from $50. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from STT on August 18 2025. Prices were last updated on July 23 2025 and have not changed since.
How many flights per day from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU)?
Each day on average, 11 nonstop flights take off from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU). Select the departure time that best suits your plans.
What are the most popular departure times for flights from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU)?
Flights between STT and SJU are busiest at 5 PM. If you'd like a quieter trip and potentially cheaper tickets, look for a departure outside the usual busy windows.
What day of the week has the most flights from STT to SJU?
If you depart on a Saturday, you'll get the greatest range of choices for flights from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU).
What is the earliest flight from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU)?
Hop on the earliest flight at around 8:39AM UTC-4, heading out of Cyril E. King Airport (STT). You'll be traveling for approximately 35m, arriving at Luis Munoz Marin Intl. Airport (SJU) at approximately 9:14AM UTC-4.
How long does it take to fly from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU)?
The average flight time from STT to SJU is 36 minutes, covering a distance of 70 mi.
What airline has the least delays from STT to SJU?
With 85% of journeys typically arriving on time, Silver Airways has the best on-time performance for direct flights from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU). To check your flight status and get notified about any changes, use the Expedia App.
What is the best time to fly from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU)?
Select a flight from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU) that leaves before 3 PM to reduce the likelihood of delays and cancellations. Departures after this time have a 22% higher chance of being canceled, on average.**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 San Juan from Cyril E. King Airport (STT)?
If you're traveling on a direct flight from Cyril E. King Airport (STT) to San Juan, you'll come into land at either Luis Munoz Marin Intl. Airport (SJU) or Antonio Rivera Rodriguez Airport (VQS).
Is it cheaper to buy a plane ticket from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU) last-minute?
Booking your plane ticket from STT to SJU just before your getaway is usually more expensive. However, if there's some wiggle room with your departure dates and times, you could grab a cheap last-minute fare.
Can I cancel or change the date of my flight from Cyril E. King Airport (STT) to Luis Munoz Marin Intl. Airport (SJU)?
In most instances, you're able to cancel or reschedule your STT to SJU flight. However, there may be additional charges, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you want further details, head to our Customer Service portal.

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