$144 Cheap United flights St. Louis (STL) to San Francisco (SFO)

Scoring cheap one-way United Airlines flights from STL to SFO from $144 on Expedia is easy — just filter by “Price (lowest to highest).” Alternatively, check out our affordable return fares from $244 for your next break.**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.

February is one of the cheapest months to fly to San Francisco with United Airlines. You could also find great deals on one-way and return fares in April.

To find cheap United Airlines fares from Lambert-St. Louis Intl. Airport (STL) to San Francisco Intl. Airport (SFO), start searching one to three months before your intended departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also affect the price you pay. Sunday is generally the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your trip on a Sunday.**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.

Easily travel from Lambert-St. Louis Intl. Airport (STL) to San Francisco Intl. Airport (SFO) on any of United Airlines’s 7 direct weekly flights. Apply our “Nonstop” and “Airline” filters to find the United Airlines flight that’ll land at SFO at your preferred time.

Leave Lambert-St. Louis Intl. Airport (STL) for San Francisco Intl. Airport (SFO) on a nonstop United Airlines flight, and you’ll be airborne for around 4h 45m.

Taking off from STL at 7:00AM UTC-6, the earliest United Airlines flight to SFO lands at 9:45AM UTC-8. Flying earlier in the day means you’re less likely to experience cancellations.* Prefer a later start? The last United Airlines flight from STL to SFO departs at 7:00AM UTC-6 and touches down at 9:45AM 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.

Hop on a United Airlines flight from Lambert-St. Louis Intl. Airport (STL) to San Francisco, and you’ll most likely land at San Francisco Intl. Airport (SFO). This is the airline’s main hub here.

Offering a rewarding loyalty program, United Airlines is a top choice for many travelers flying from STL to SFO. 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.

You’ll likely be seated on an Airbus A319 or a Boeing 737 MAX 8 when flying United Airlines from Lambert-St. Louis Intl. Airport (STL) to San Francisco Intl. Airport (SFO). However, keep in mind that a different plane could be assigned to your route due to operational demands.

Changes are often free within 24 hours of booking, but your airline may add a charge after that time. For more information about modifying your reservation, check out your “Trips,” select your flight and click on “Manage Booking.” If you want the flexibility to change your itinerary without extra charges, apply the “Changes included” or “No cancel fee” filter when planning your next adventure.