| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| May 20 | SEA | SFO | 11:13 | 12:48 |
Delayed
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| May 19 | SEA | SFO | 10:33 | 12:09 |
Delayed
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| May 18 | SEA | SFO | 10:52 | 12:31 |
Delayed
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| May 17 | SEA | SFO | 10:12 | 11:46 |
Delayed
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| May 16 | SEA | SFO | 09:42 | 11:25 |
Landed Late
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| May 15 | SEA | SFO | 15:23 | 10:57 |
En-Route
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| May 14 | SEA | SFO | 10:58 | 12:39 |
Delayed
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| May 13 | SEA | SFO | 11:17 | 12:58 |
Delayed
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| May 12 | SEA | SFO | 10:21 | 12:09 |
Delayed
|
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| May 11 | SEA | SFO | 09:41 | 11:24 |
Landed Late
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United Airlines Flight UA2121 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 UA2121 flight from Seattle to San Francisco?
The average flight time from Seattle to San Francisco is 1 hour and 40 minutes. The flight distance is 1093 km / 679 miles and the average flight speed is 638 km/h / 397 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA2121 Seattle to San Francisco?
The Airportia On-Time Performance Rating for United Airlines Flight UA2121 is 3.9/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight UA2121 arriving at?
Flight UA2121 arrives at San Francisco International Airport (SFO) Terminal 2.
When was the latest UA2121 flight?
The latest flight took off on Wednesday, May 20th, 2026 with the flight status being En-Route on 12:48.
How else can the flight UA2121 be referenced as?
This United Airlines flight can also be referenced as UAL2121, UA 2121, UAL 2121.
How often is flight UA2121 delayed?
On average, 90% of all UA2121 flights are delayed. The average delay is 75 minutes.
Can I get compensation for my delayed or cancelled UA2121 flight or baggage issues?
If your UA2121 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 UA2121 Flight Tracker above for more details.
Flight UA2121 is code-shared by 5 airlines using the flight numbers AV2037, CA7306, NH7305, NZ9421, VA8298
Other flights departing from Seattle SEA: UA5657, AS3327, AS2239, AS7006
Other flights arriving at San Francisco SFO: UA611, UA1394, WN1749, UA1328
All flights connecting Seattle SEA to San Francisco SFO.