| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Mar 28 | ORD | ONT | 20:50 | 22:44 |
Landed Late
|
Track > |
| Mar 27 | ORD | ONT | 20:23 | 22:25 |
Landed
|
Track > |
| Mar 26 | ORD | ONT | 22:51 | 00:51 |
Delayed
|
Track > |
| Mar 25 | ORD | ONT | 21:02 | 22:51 |
Landed Late
|
Track > |
| Mar 24 | ORD | ONT | 20:17 | 22:02 |
Landed
|
Track > |
| Mar 23 | ORD | ONT | 20:20 | 21:56 |
Landed
|
Track > |
| Mar 22 | ORD | ONT | 21:24 | 23:16 |
Delayed
|
Track > |
| Mar 21 | ORD | ONT | 20:14 | 21:53 |
Landed
|
Track > |
| Mar 20 | ORD | ONT | 21:07 | 22:49 |
Landed Late
|
Track > |
| Mar 19 | ORD | ONT | 20:35 | 22:17 |
Landed
|
Track > |
United Airlines Flight UA1851 connects Chicago, United States to Ontario, United States, taking off from Chicago O'Hare International Airport ORD and landing at Ontario International Airport ONT.
How long is the UA1851 flight from Chicago to Ontario?
The average flight time from Chicago to Ontario is 3 hours and 48 minutes. The flight distance is 2730 km / 1696 miles and the average flight speed is 719 km/h / 447 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA1851 Chicago to Ontario?
The Airportia On-Time Performance Rating for United Airlines Flight UA1851 is 4.5/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight UA1851 arriving at?
Flight UA1851 arrives at Ontario International Airport (ONT) Terminal 2.
When was the latest UA1851 flight?
The latest flight took off on Sunday, March 29th, 2026 with the flight status being Landed on 22:44.
How else can the flight UA1851 be referenced as?
This United Airlines flight can also be referenced as UAL1851, UA 1851, UAL 1851.
How often is flight UA1851 delayed?
On average, 60% of all UA1851 flights are delayed. The average delay is 51 minutes.
Can I get compensation for my delayed or cancelled UA1851 flight or baggage issues?
If your UA1851 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 UA1851 Flight Tracker above for more details.
Other flights departing from Chicago ORD: UA5256, AA4983, UA1625, UA5327
Other flights arriving at Ontario ONT: WN313, AA2277, WN981, AA1782
All flights connecting Chicago ORD to Ontario ONT.