$69 Cheap United flights San Francisco (SFO) to Boise (BOI)

You'll find affordable return United Airlines flights from $137 from SFO to BOI by filtering your results from "Price (lowest to highest)" on Expedia. Or search for bargains from $69 for a one-way trip.**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 ahead of your travel date to score cheaper fares on United Airlines flights from San Francisco Intl. Airport (SFO) to Boise Airport (BOI). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to 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.* Nail your timing, 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.

The earliest United Airlines flight from SFO to BOI takes off at 8:35AM UTC-8, landing at 11:27AM UTC-7. If you prefer to jet off later, the last United Airlines flight leaves SFO at 7:10PM UTC-8 and touches down at BOI at 10:01PM UTC-7. Flying earlier is generally a good idea as morning flights tend to experience fewer 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.

With a rewarding loyalty program, United Airlines is a favorite of many travelers departing from SFO to BOI. Plus, as a United Mileage Plus and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.