$339 Cheap United flights San Francisco (SFO) to Singapore (SIN)

You can find budget-friendly return United Airlines flights from $641 from SFO to SIN by filtering your results from "Price (lowest to highest)" on Expedia. Or search for bargains from $339 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.

To get affordable flights from SFO to SIN with United Airlines, begin searching about one month before your intended departure. You can save 17% when you lock in your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Another tip? Booking on Sunday can lead to average savings of 17% compared to Friday (the most expensive day).**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 first flight from SFO to SIN with United Airlines departs at 10:40AM UTC-8. You'll land at 8:15PM UTC+8. The last United Airlines flight of the day leaves at 10:40PM UTC-8 and arrives at 8:00AM UTC+8. With 20% fewer cancellations for departures before midday, heading out early is usually the wisest option.**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 passengers departing from SFO to SIN. Plus, if you're a United Mileage Plus and One Key™ member booking through Expedia, you can earn OneKeyCash™* on eligible flights along with your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.