United Airlines flights from San Francisco to London (SFO - LON)

• Can I get a flight from San Francisco to London on United Airlines for under $900?

  Cheapflights users have found 23 United Airlines flights for under $900 on the SFO-LON route. Prices on flights to London from San Francisco can vary based on many factors including dates. To look at price based on your preferred dates, click here.

• How do most travelers feel about United Airlines?

  Cheapflights users who travel with United Airlines (a popular airline from San Francisco to London) have rated them a 6.8/10. This rating comes from 29 reviews. If you are looking to travel SFO-LON, search your dates above.

Currently, the most affordable month to book a United Airlines flight from San Francisco to London in November, with an average price of $653. Conversely, traveling with United Airlines from San Francisco to London in June will be the most expensive, with an average cost of $1,158. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).