| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Mar 04 | DEN | ONT | 19:46 | 20:45 |
Landed
|
Track > |
| Mar 03 | DEN | ONT | 19:40 | 20:33 |
Landed
|
Track > |
| Mar 02 | DEN | ONT | 19:50 | 20:50 |
Landed
|
Track > |
| Mar 01 | DEN | ONT | 19:35 | 20:31 |
Landed
|
Track > |
| Feb 28 | DEN | ONT | 19:41 | 20:38 |
Landed
|
Track > |
| Feb 27 | DEN | ONT | 19:30 | 20:28 |
Landed
|
Track > |
| Feb 26 | DEN | ONT | 19:34 | 20:31 |
Landed
|
Track > |
| Feb 25 | DEN | ONT | 21:10 | 22:09 |
Delayed
|
Track > |
| Feb 24 | DEN | ONT | 19:53 | 20:52 |
Landed
|
Track > |
| Feb 23 | DEN | ONT | 20:00 | 20:51 |
Landed
|
Track > |
United Airlines Flight UA1221 connects Denver, United States to Ontario, United States, taking off from Denver International Airport DEN and landing at Ontario International Airport ONT.
How long is the UA1221 flight from Denver to Ontario?
The average flight time from Denver to Ontario is 1 hour and 56 minutes. The flight distance is 1316 km / 818 miles and the average flight speed is 676 km/h / 420 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA1221 Denver to Ontario?
The Airportia On-Time Performance Rating for United Airlines Flight UA1221 is 4.9/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight UA1221 arriving at?
Flight UA1221 arrives at Ontario International Airport (ONT) Terminal 2.
When was the latest UA1221 flight?
The latest flight took off on Thursday, March 5th, 2026 with the flight status being Landed on 20:45.
How else can the flight UA1221 be referenced as?
This United Airlines flight can also be referenced as UAL1221, UA 1221, UAL 1221.
How often is flight UA1221 delayed?
On average, 30% of all UA1221 flights are delayed. The average delay is 27 minutes.
Can I get compensation for my delayed or cancelled UA1221 flight or baggage issues?
If your UA1221 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 UA1221 Flight Tracker above for more details.
Flight UA1221 is code-shared by 1 airline using the flight number AC3499
Other flights departing from Denver DEN: UA2171, UA5390, UA5445, UA1153
Other flights arriving at Ontario ONT: WN1642, WN4790, WN2334, WN2279
All flights connecting Denver DEN to Ontario ONT.