There are 35 flights available on United Airlines from Boston to San Francisco for under $400. These prices can change based on many factors including date and time. To find BOS-SFO flight prices for your dates, click here.
1,393 Cheapflights users have left reviews for United Airlines and have rated the airline 8.0/10. If you are looking to travel from Boston to San Francisco on United Airlines, input your dates in the form above for our best prices!