$79 Cheap Spirit Airlines flights Boston (BOS) to San Juan (SJU)

Make use of the “Price (lowest to highest)” filter on Expedia to find cheap Spirit Airlines round-trip flights from $153 from BOS to SJU. Affordable one-way tickets from $79 are available too.**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.

Look for round-trip or one-way flights to San Juan in October or September. You could find lower fares with Spirit Airlines during these quieter months.

Search for Spirit Airlines flights from BOS to SJU about one month before you want to go. The cheapest time to book an international flight is generally 18 to 29 days ahead of your travel date when you can save 17% versus booking four to five months in advance. Regardless of itinerary or ticket type, the best day of the week to book international airfare is usually Sunday. Friday can be the most expensive. Passengers who book on a Sunday can save 17% on average compared to those who book on a Friday.**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.

To see if there’s a direct route from BOS to SJU with Spirit Airlines or other carriers, check the “Nonstop” box when searching for tickets.

Find Spirit Airlines’s earliest flights from BOS to SJU by selecting our “Early Morning” and “Morning” filters. Not only will you arrive sooner, early departures also have a 20% less chance of being canceled.**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.

Spirit Airlines flights from Logan Intl. Airport (BOS) to San Juan come in to Luis Munoz Marin Intl. Airport (SJU). This is the main entry point to this city.

A rewarding loyalty program and the chance to rack up points through Free Spirit are the start of the reasons to travel from BOS to SJU with Spirit Airlines. Plus, when you join Expedia’s free One Key™ program, you can earn OneKeyCash™* on top of any airline loyalty program earnings. You can put it toward your future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are typically free within 24 hours of booking, but your airline may charge you after that time. For more details about altering your flights, head to your “Trips,” select your flight and click on “Manage Booking.” If you want the flexibility to update your itinerary without being charged, check the “Changes included” or “No cancel fee” filter when organizing your next trip.