$269 Cheap United flights Washington (IAD) to Sacramento (SMF)

Finding cheap one-way United Airlines flights from IAD to SMF from $269 on Expedia is simple — just filter by "Price (lowest to highest)." Alternatively, check out our budget-friendly round-trip fares from $289 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.

Start searching one to three months ahead of your departure date to score cheaper fares on United Airlines flights from Washington Dulles Intl. Airport (IAD) to Sacramento Intl. Airport (SMF). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Nail your timing, and you can enjoy significant savings on domestic trips.*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 IAD to SMF with United Airlines leaves at 5:50PM UTC-5. You'll touch down at 8:56PM UTC-8. The last United Airlines flight of the day leaves at 5:50PM UTC-5 and arrives at 8:56PM UTC-8. With around 20% fewer cancellations for departures before noon, setting off early is usually the best choice.**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 jet off from IAD to SMF with United Airlines. Plus, when you sign up to our One Key™ program, you can receive OneKeyCash™* on top of United Airlines's loyalty program earnings. It's yours to spend on future travel plans.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.