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(UA) United Airlines 4521 On-Time Performance Rating

Date Range:

15-Nov-2025 to 15-Jan-2026

(EWR) Newark Liberty International Airport

Newark, NJ, US

(PIT) Pittsburgh International Airport

Pittsburgh, PA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
9
60%
Late
2
13%
Very Late
1
7%
Excessive
2
13%
Cancelled
1
7%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
15
Total Delays ( > 1 min )
7
Codeshares
15
Average Delay (min.)
74
Standard Deviation
131.7
Min
0
Max
370

UA 4521 On-Time Performance Details

Overall Rating
0.4 of 5
Very Poor
Percentage On-Time 60%
Average Delay Time 74 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 0.4 shows that this flight has on-time performance characteristics better than 7% of all other flights in the FlightStats database.
On-Time Performance Rating
0.6 of 5
Poor
Percentage On-Time 60%
This flight has an on-time performance of 60%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 12% of other flights.
Delay Performance
0.2 of 5
Very Poor
Average Delay Time 74 min
This flight has an average delay of 74 minutes with a standard deviation of 131.7 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 4% of other flights.

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