$119 Cheap United flights Boston (BOS) to San Francisco (SFO)

Scoring cheap one-way United Airlines flights from BOS to SFO from $119 on Expedia couldn’t be simpler — just filter by “Price (lowest to highest).” Alternatively, check out our affordable round-trip fares from $233 for your next exciting adventure.**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.

United Airlines flights to San Francisco are usually cheaper in the off-peak months of February and April. Whether you’re in search of a one-way or a return ticket, you could find a better deal then.

Look for affordable United Airlines flights from Logan Intl. Airport (BOS) to San Francisco Intl. Airport (SFO) one to three months prior to your day of departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare class and itinerary, the best day of the week to book a domestic flight is usually Sunday and the most expensive day tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**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.

Skip the layovers and fly from Logan Intl. Airport (BOS) to San Francisco Intl. Airport (SFO) on any of United Airlines’s 28 weekly direct flights. Use Expedia’s “Nonstop” and “Airline” filters to find the United Airlines flight that’ll land at SFO at your preferred time.

It takes around 6h 51m to fly nonstop from Logan Intl. Airport (BOS) to San Francisco Intl. Airport (SFO) with United Airlines.

If you’re looking for flexibility, Thursday offers the most choice for United Airlines flights from Logan Intl. Airport (BOS) to San Francisco Intl. Airport (SFO). You can pick from 4 different departures.

Setting off from BOS at 8:00AM UTC-5, the earliest United Airlines flight to SFO arrives at 11:53AM UTC-8. Traveling early means you’re less likely to experience cancellations.* Not a morning person? The last United Airlines flight from BOS to SFO departs at 6:00PM UTC-5 and touches down at 9:50PM UTC-8.*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.

San Francisco Intl. Airport (SFO) is the primary San Francisco gateway for United Airlines flights from Logan Intl. Airport (BOS).

With a rewarding loyalty program, United Airlines is a top pick for many passengers departing from BOS to SFO. 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.

For the Logan Intl. Airport (BOS) to San Francisco Intl. Airport (SFO) route, United Airlines typically uses Boeing 757-200 and Boeing 737 MAX 9 planes. Remember that last-minute changes can occur for operational reasons, so your flight could be on a different aircraft.

Depending on the type of fare you purchased, a fee will generally apply if you cancel or reschedule your flight more than 24 hours after it’s confirmed. To secure flexible plane tickets, select our “Changes included” and “No cancel fee” boxes when looking for flights. To learn more about modifying or canceling your reservation, visit “Trips,” select your flight and tick “Manage Booking.”