$43 Cheap Spirit Airlines flights Boise (BOI) to San Jose (SJC)

Apply the "Price (lowest to highest)" filter on Expedia to look for cheap Spirit Airlines round-trip flights from $112 from BOI to SJC. Affordable one-way fares from $43 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.

Start searching one to three months before your departure to score cheaper fares on Spirit Airlines flights from Boise Airport (BOI) to Norman Y. Mineta San Jose Intl. Airport (SJC). 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.* Get the timing right, and you can enjoy significant savings on domestic flights.*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.

Sort your results by "Early Morning" and "Morning" to browse the earliest flights from BOI to SJC. Heading off early means you're 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.

Depart from BOI to SJC with Spirit Airlines and look forward to a range of benefits starting with a rewarding loyalty program. When you book through Expedia as a Free Spirit and One Key™ member, you can also earn OneKeyCash™* to spend on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.