| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Jan 05 | ONT | SFO | 11:35 | 12:42 |
Landed
|
Track > |
| Jan 04 | ONT | SFO | 11:25 | 12:28 |
Landed
|
Track > |
| Jan 03 | ONT | SFO | 15:00 | 12:28 |
Unknown
|
Track > |
| Jan 02 | ONT | SFO | 12:28 | 13:26 |
Delayed
|
Track > |
| Jan 01 | ONT | SFO | 11:13 | 12:14 |
Landed
|
Track > |
| Dec 31 | ONT | SFO | 11:18 | 12:15 |
Landed
|
Track > |
| Dec 30 | ONT | SFO | 10:56 | 11:48 |
Landed
|
Track > |
| Dec 29 | ONT | SFO | 11:48 | 12:47 |
Landed Late
|
Track > |
| Dec 28 | ONT | SFO | 10:51 | 11:53 |
Landed
|
Track > |
| Dec 27 | ONT | SFO | 11:12 | 12:12 |
Landed
|
Track > |
United Airlines Flight UA4639 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 UA4639 flight from Ontario to San Francisco?
The average flight time from Ontario to San Francisco is 59 minutes. The flight distance is 585 km / 363 miles and the average flight speed is 563 km/h / 350 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA4639 Ontario to San Francisco?
The Airportia On-Time Performance Rating for United Airlines Flight UA4639 is 4.9/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight UA4639 arriving at?
Flight UA4639 arrives at San Francisco International Airport (SFO) Terminal 3.
When was the latest UA4639 flight?
The latest flight took off on Monday, January 5th, 2026 with the flight status being Landed on 12:42.
How else can the flight UA4639 be referenced as?
This United Airlines flight can also be referenced as UAL4639, UA 4639, UAL 4639.
How often is flight UA4639 delayed?
On average, 30% of all UA4639 flights are delayed. The average delay is 29 minutes.
Can I get compensation for my delayed or cancelled UA4639 flight or baggage issues?
If your UA4639 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 UA4639 Flight Tracker above for more details.
Flight UA4639 is code-shared by 2 airlines using the flight numbers AC4424, EK6212
Other flights departing from Ontario ONT: WN441, WN2127, WN1945, WN669
Other flights arriving at San Francisco SFO: UA1498, AS2072, WN4672, AS2372
All flights connecting Ontario ONT to San Francisco SFO.
