$175 Cheap Southwest Airlines flights San Juan (SJU) to San Francisco (SFO)

Scoring cheap one-way Southwest Airlines flights from SJU to SFO from $175 on Expedia is a breeze — just filter by “Price (lowest to highest).” Alternatively, check out our budget-friendly round-trip fares from $367 for your next break.**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.

February is one of the least expensive months to get away to San Francisco with Southwest Airlines. You could also find excellent prices on one-way and round-trip tickets in April.

Check for Southwest Airlines flights from SJU to SFO about one month before you want to go. The most affordable time to book an international flight is usually 18 to 29 days ahead of your departure date when you can save 17% versus booking four to five months in advance. No matter your fare class or itinerary, the best day of the week to book international airfare is usually Sunday. Friday can be the most expensive. Travelers 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.

Select our “Nonstop” filter when browsing for direct Southwest Airlines flights from SJU to SFO. It’s also a good way to compare other airlines servicing the same nonstop journey.

Sort your results by “Morning” and “Early Morning” to find the earliest flights from SJU to SFO. Jetting off early means you’re 20% less likely to experience 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.

San Francisco Intl. Airport (SFO) is the primary San Francisco gateway for Southwest Airlines flights from Luis Munoz Marin Intl. Airport (SJU).

Changes are typically free within 24 hours of making a booking, but your airline may add a charge after that time. For further details about altering your flights, check out your “Trips,” select your flight and click on “Manage Booking.” If you want the flexibility to change your itinerary without additional charges, apply the “No cancel fee” or “Changes included” filter when organizing your next adventure.