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(UA) United Airlines 1851 On-Time Performance Rating

Date Range:

01-Apr-2026 to 31-May-2026

(ONT) Ontario International Airport

Ontario, CA, US

(SFO) San Francisco International Airport

San Francisco, CA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
5
33%
Late
0
0%
Very Late
2
13%
Excessive
8
53%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
15
Total Delays ( > 1 min )
10
Codeshares
0
Average Delay (min.)
64.7
Standard Deviation
19.9
Min
0
Max
93

UA 1851 On-Time Performance Details

Overall Rating
0.1 of 5
Very Poor
Percentage On-Time 33%
Average Delay Time 64.7 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 0.1 shows that this flight has on-time performance characteristics better than 0% of all other flights in the FlightStats database.
On-Time Performance Rating
0.0 of 5
Very Poor
Percentage On-Time 33%
This flight has an on-time performance of 33%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 0% of other flights.
Delay Performance
0.1 of 5
Very Poor
Average Delay Time 64.7 min
This flight has an average delay of 64.7 minutes with a standard deviation of 19.9 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 3% of other flights.

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