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(UA) United Airlines 4521 On-Time Performance Rating

Date Range:

01-May-2026 to 30-Jun-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
46
87%
Late
1
2%
Very Late
0
0%
Excessive
4
8%
Cancelled
1
2%
Diverted
1
2%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
52
Total Delays ( > 1 min )
12
Codeshares
52
Average Delay (min.)
58.583333333333336
Standard Deviation
95.5
Min
0
Max
329

UA 4521 On-Time Performance Details

Overall Rating
2.6 of 5
Average
Percentage On-Time 89%
Average Delay Time 58.583333333333336 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.6 shows that this flight has on-time performance characteristics better than 51% of all other flights in the FlightStats database.
On-Time Performance Rating
4.9 of 5
Very Good
Percentage On-Time 89%
This flight has an on-time performance of 89%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 98% of other flights.
Delay Performance
0.3 of 5
Very Poor
Average Delay Time 58.583333333333336 min
This flight has an average delay of 58.583333333333336 minutes with a standard deviation of 95.5 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 7% of other flights.

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