$29 Cheap Southwest Airlines flights San Diego (SAN) to San Francisco (SFO)

Apply the "Price (lowest to highest)" filter on Expedia to look for cheap Southwest Airlines return flights from $57 from SAN to SFO. Affordable one-way fares from $29 are available as well.**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.

Begin your search one to three months ahead of your travel date to find cheaper fares on Southwest Airlines flights from San Diego Intl. Airport (SAN) to San Francisco Intl. Airport (SFO). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Time it well, and you can enjoy significant savings on domestic journeys.*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 earliest flight from SAN to SFO with Southwest Airlines departs at 7:50AM UTC-8. You'll land at 9:30AM UTC-8. The last Southwest Airlines flight of the day takes off at 8:30PM UTC-8 and arrives at 10:10PM UTC-8. With 20% fewer cancellations for morning and mid-morning departures, beginning your travel day early is generally the smartest choice.**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.