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(UA) United Airlines 1221 On-Time Performance Rating

Date Range:

15-Dec-2025 to 15-Feb-2026

(DEN) Denver International Airport

Denver, CO, US

(ONT) Ontario International Airport

Ontario, CA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
14
82%
Late
0
0%
Very Late
1
6%
Excessive
2
12%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
17
Total Delays ( > 1 min )
8
Codeshares
0
Average Delay (min.)
33.75
Standard Deviation
46.4
Min
0
Max
128

UA 1221 On-Time Performance Details

Overall Rating
3.1 of 5
Average
Percentage On-Time 82%
Average Delay Time 33.75 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 3.1 shows that this flight has on-time performance characteristics better than 61% of all other flights in the FlightStats database.
On-Time Performance Rating
3.9 of 5
Good
Percentage On-Time 82%
This flight has an on-time performance of 82%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 79% of other flights.
Delay Performance
2.3 of 5
Average
Average Delay Time 33.75 min
This flight has an average delay of 33.75 minutes with a standard deviation of 46.4 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 46% of other flights.

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