| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| May 18 | ONT | SFO | 12:28 | 13:30 |
Delayed
|
Track > |
| May 17 | ONT | SFO | 12:03 | 13:09 |
Delayed
|
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| May 16 | ONT | SFO | 12:07 | 13:09 |
Landed Late
|
Track > |
| May 15 | ONT | SFO | 10:52 | 12:02 |
Landed
|
Track > |
| May 14 | ONT | SFO | 10:52 | 11:51 |
Landed
|
Track > |
| May 11 | ONT | SFO | 11:59 | 12:59 |
Landed Late
|
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| May 10 | ONT | SFO | 12:02 | 13:11 |
Delayed
|
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| May 09 | ONT | SFO | 10:42 | 11:51 |
Landed
|
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| May 04 | ONT | SFO | 12:06 | 13:44 |
Unknown
|
Track > |
| May 03 | ONT | SFO | 11:52 | 13:31 |
Unknown
|
Track > |
United Airlines Flight UA1851 connects Ontario, United States to San Francisco, United States, taking off from Ontario International Airport ONT and landing at San Francisco International Airport SFO.
How long is the UA1851 flight from Ontario to San Francisco?
The average flight time from Ontario to San Francisco is 1 hour and 11 minutes. The flight distance is 585 km / 363 miles and the average flight speed is 507 km/h / 315 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA1851 Ontario to San Francisco?
The Airportia On-Time Performance Rating for United Airlines Flight UA1851 is 4.2/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight UA1851 arriving at?
Flight UA1851 arrives at San Francisco International Airport (SFO) Terminal 2.
When was the latest UA1851 flight?
The latest flight took off on Monday, May 18th, 2026 with the flight status being En-Route on 13:30.
How else can the flight UA1851 be referenced as?
This United Airlines flight can also be referenced as UAL1851, UA 1851, UAL 1851.
How often is flight UA1851 delayed?
On average, 70% of all UA1851 flights are delayed. The average delay is 70 minutes.
Can I get compensation for my delayed or cancelled UA1851 flight or baggage issues?
If your UA1851 flight was cancelled, delayed, or if you experienced baggage issues such as delayed, damaged, or lost bags, you may be entitled to compensation. Compensation amounts and eligibility depend on various regulations, including EC 261/2004, UK261, CA Montreal Convention, US GoodWill, BR-ANAC, SA-GACA and TK-SHY.
See our UA1851 Flight Tracker above for more details.
Flight UA1851 is code-shared by 1 airline using the flight number AC4424
Other flights departing from Ontario ONT: AA3168, F91262, AA2461, WN106
Other flights arriving at San Francisco SFO: UA3974, AA2814, F91093, ST11
All flights connecting Ontario ONT to San Francisco SFO.