$69 Cheap United flights Seattle (SEA) to San Francisco (SFO)

Finding cheap one-way United Airlines flights from SEA to SFO from $69 on Expedia is simple — just filter by "Price (lowest to highest)." Or check out our budget-friendly return fares from $139 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.

Search for cheap United Airlines flights from Seattle - Tacoma Intl. Airport (SEA) to San Francisco Intl. Airport (SFO) one to three months before your 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 type and itinerary, the best day to book a domestic flight is usually Sunday and the most expensive is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book 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.

Departing SEA at 5:45AM UTC-8, the first United Airlines flight to SFO arrives at 8:05AM UTC-8. Traveling earlier in the day means you'll be less likely to experience cancellations.* Prefer to travel later? The last United Airlines flight from SEA to SFO departs at 5:15PM UTC-8 and touches down at 7:34PM 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.

A rewarding loyalty program and the opportunity to collect points through United Mileage Plus are the start of the reasons to leave from SEA to SFO with United Airlines. Plus, by joining Expedia's free One Key™ program, you can receive OneKeyCash™* alongside United Airlines's loyalty program earnings. It's yours to spend on your next adventure.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.