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(UA) United Airlines 4521 On-Time Performance Rating

Date Range:

15-Jul-2026 to 15-Sep-2026

(IAD) Washington Dulles International Airport

Dulles, VA, US

(CVG) Cincinnati/Northern Kentucky International Airport

Cincinnati, OH, US

On-Time Performance Chart

(using rounded numbers)
On-Time
8
53%
Late
1
7%
Very Late
0
0%
Excessive
4
27%
Cancelled
2
13%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
15
Total Delays ( > 1 min )
6
Codeshares
15
Average Delay (min.)
116
Standard Deviation
105.6
Min
0
Max
272

UA 4521 On-Time Performance Details

Overall Rating
0.1 of 5
Very Poor
Percentage On-Time 53%
Average Delay Time 116 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
0.2 of 5
Very Poor
Percentage On-Time 53%
This flight has an on-time performance of 53%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 4% of other flights.
Delay Performance
0.0 of 5
Very Poor
Average Delay Time 116 min
This flight has an average delay of 116 minutes with a standard deviation of 105.6 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 0% of other flights.

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