$52 Cheap Frontier Airlines flights San Juan (SJU) to St. Thomas (STT)

Make use of the "Price (lowest to highest)" filter on Expedia to search for cheap Frontier Airlines return flights from $77 from SJU to STT. Affordable one-way fares from $52 are also on offer.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

To discover affordable flights from SJU to STT with Frontier Airlines, start your search about one month before your planned departure. You can save 17% when you lock in your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Another good tip? Booking on Sunday can lead to average savings of 17% compared to Friday (the most expensive day).**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.

The first Frontier Airlines flight from SJU to STT takes off at 12:06PM UTC-4, landing at 12:55PM UTC-4. If you prefer to set off later in the day, the last Frontier Airlines flight leaves SJU at 12:06PM UTC-4 and lands at STT at 12:55PM UTC-4. Flying early is generally a wise choice as morning and mid-morning flights are least likely to face cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.

A rewarding loyalty program and the ability to collect points through Frontier Miles are the start of the reasons to travel from SJU to STT with Frontier Airlines. Plus, when you sign up to our One Key™ program, you can earn OneKeyCash™* on top of any airline loyalty program earnings. It's yours to spend on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.