| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| May 20 | SFO | DEN | 14:06 | 17:13 |
Landed Late
|
Track > |
| May 19 | SFO | DEN | 13:18 | 16:20 |
Landed
|
Track > |
| May 18 | SFO | DEN | 14:02 | 16:57 |
Landed Late
|
Track > |
| May 17 | SFO | DEN | 13:48 | 16:47 |
Landed Late
|
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| May 16 | SFO | DEN | 13:38 | 16:45 |
Landed Late
|
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| May 15 | SFO | DEN | 13:34 | 16:29 |
En-Route
|
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| May 14 | SFO | DEN | 13:45 | 16:48 |
Landed Late
|
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| May 13 | SFO | DEN | 13:41 | 16:29 |
Unknown
|
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| May 12 | SFO | DEN | 13:43 | 16:29 |
Unknown
|
Track > |
| May 11 | SFO | DEN | 13:34 | 16:35 |
Landed
|
Track > |
United Airlines Flight UA2121 connects San Francisco, United States to Denver, United States, taking off from San Francisco International Airport SFO and landing at Denver International Airport DEN.
How long is the UA2121 flight from San Francisco to Denver?
The average flight time from San Francisco to Denver is 2 hours and 2 minutes. The flight distance is 1553 km / 965 miles and the average flight speed is 705 km/h / 438 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA2121 San Francisco to Denver?
The Airportia On-Time Performance Rating for United Airlines Flight UA2121 is 4.8/5 stars. This metric is calculated using data from the past 10 flights.
When was the latest UA2121 flight?
The latest flight took off on Wednesday, May 20th, 2026 with the flight status being Landed on 17:13.
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, 60% of all UA2121 flights are delayed. The average delay is 21 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 AC4049, CA7308, NH7320, NZ9056, VA8339
Other flights departing from San Francisco SFO: UA5997, UA362, CA986, UA3934
Other flights arriving at Denver DEN: WN1479, WN4444, WN2864, UA4630
All flights connecting San Francisco SFO to Denver DEN.
