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(UA) United Airlines 4521 On-Time Performance Rating

Date Range:

15-Aug-2026 to 15-Oct-2026

(IAD) Washington Dulles International Airport

Dulles, VA, US

(PVD) Rhode Island T. F. Green International Airport

Providence, RI, US

On-Time Performance Chart

(using rounded numbers)
On-Time
12
57%
Late
2
10%
Very Late
1
5%
Excessive
6
29%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
21
Total Delays ( > 1 min )
11
Codeshares
21
Average Delay (min.)
66.81818181818181
Standard Deviation
64
Min
0
Max
232

UA 4521 On-Time Performance Details

Overall Rating
0.1 of 5
Very Poor
Percentage On-Time 57%
Average Delay Time 66.81818181818181 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 1% of all other flights in the FlightStats database.
On-Time Performance Rating
0.1 of 5
Very Poor
Percentage On-Time 57%
This flight has an on-time performance of 57%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 1% of other flights.
Delay Performance
0.1 of 5
Very Poor
Average Delay Time 66.81818181818181 min
This flight has an average delay of 66.81818181818181 minutes with a standard deviation of 64 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 2% of other flights.

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