$104 Cheap United flights San Diego (SAN) to Boston (BOS)

Grab cheap return United Airlines flights from $173 from SAN to BOS by filtering your results from “Price (lowest to highest)” on Expedia. Or look for options from $104 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.

Search for return or one-way flights to Boston in January or February. You could find cheaper fares with United Airlines during these off-peak times.

Start searching one to three months ahead of your travel date to score cheaper fares on United Airlines flights from San Diego Intl. Airport (SAN) to Logan Intl. Airport (BOS). 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.* 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.

To see if there’s a direct route from SAN to BOS with United Airlines or another carrier, check the “Nonstop” filter when searching for flights.

Browse United Airlines’s earliest flights from SAN to BOS by selecting the “Early Morning” and “Morning” filters. Not only will you get to your destination sooner, early departures also have a 20% less chance of being canceled.**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.

Logan Intl. Airport (BOS) is the primary Boston hub for United Airlines flights from San Diego Intl. Airport (SAN).

Travel from SAN to BOS with United Airlines and you’ll enjoy a host of benefits starting with a rewarding loyalty program. When booking through Expedia as a United Mileage Plus and One Key™ member, you could also earn OneKeyCash™* to redeem on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

In most cases, you can change or cancel your flight, although additional fees may apply if you made your booking more than 24 hours ago. Need flexible options? Apply the “Changes included” or “No cancel fee” filter to find flights that won’t charge extra if you need to alter your plans. To modify your booking, head to “Trips,” select your flight and click on “Manage Booking” for more information.