United Flight 651 Deals & Information (2025/2026)

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United Flight 651 Route Deals From $218

The cheapest prices found with in the last 7 days for return flights were $189 and $218 for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Frequently asked questions

What route does flight number UA651 take?
UA651 is used on a range of routes. Most commonly, UA651 flies straight from San Diego Intl. Airport (SAN) to San Francisco, CA Airport (SFO-San Francisco Intl.). If that's your chosen flight path, you'll be airborne for 1 hour and 31 minutes.
What terminal does UA651 fly out of?
If you're jetting off from San Diego, CA Airport (SAN-San Diego Intl.), you'll probably board the plane from Terminal 2. The most popular route for flight number UA651 is San Diego Intl. Airport (SAN) to San Francisco Airport, which is a direct flight.
What kind of plane is on flight number UA651?
UA651 is a flight number that serves several routes. If you have a ticket on the busiest route, San Diego Intl. Airport (SAN) to San Francisco Airport, there's every chance you'll be on the Airbus A319.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA651 flight with Travelocity, please visit our Customer Service Portal.