| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Jan 05 | SEA | SFO | 08:09 | 10:10 |
Landed Late
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| Jan 04 | SEA | SFO | 07:22 | 09:13 |
Landed
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| Jan 03 | SEA | SFO | 07:29 | 09:24 |
Landed
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| Jan 02 | SEA | SFO | 07:57 | 09:47 |
Landed Late
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| Jan 01 | SEA | SFO | 07:14 | 09:07 |
Landed
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| Dec 31 | SEA | SFO | 07:12 | 09:04 |
Landed
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| Dec 30 | SEA | SFO | 07:21 | 09:02 |
Landed
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| Dec 29 | SEA | SFO | 07:20 | 09:01 |
Landed
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| Dec 28 | SEA | SFO | 07:22 | 08:55 |
Landed
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| Dec 27 | SEA | SFO | 07:12 | 08:44 |
Landed
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United Airlines Flight UA643 connects Seattle, United States to San Francisco, United States, taking off from Seattle Tacoma International Airport SEA and landing at San Francisco International Airport SFO.
How long is the UA643 flight from Seattle to San Francisco?
The average flight time from Seattle to San Francisco is 1 hour and 46 minutes. The flight distance is 1093 km / 679 miles and the average flight speed is 618 km/h / 384 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA643 Seattle to San Francisco?
The Airportia On-Time Performance Rating for United Airlines Flight UA643 is 4.9/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight UA643 arriving at?
Flight UA643 arrives at San Francisco International Airport (SFO) Terminal 2.
When was the latest UA643 flight?
The latest flight took off on Monday, January 5th, 2026 with the flight status being Landed on 10:10.
How else can the flight UA643 be referenced as?
This United Airlines flight can also be referenced as UAL643, UA0643, UA 643, UAL 643.
How often is flight UA643 delayed?
On average, 20% of all UA643 flights are delayed. The average delay is 29 minutes.
Can I get compensation for my delayed or cancelled UA643 flight or baggage issues?
If your UA643 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 UA643 Flight Tracker above for more details.
Flight UA643 is code-shared by 5 airlines using the flight numbers AZ4458, NH7305, NZ9423, OZ6301, VA8293
Other flights departing from Seattle SEA: AS1482, AS3049, AS2062, 8C3330
Other flights arriving at San Francisco SFO: UA1204, UA1850, WN2629, UA1333
All flights connecting Seattle SEA to San Francisco SFO.