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(UA) United Airlines 4538 On-Time Performance Rating

Date Range:

01-Jun-2026 to 31-Jul-2026

(PHL) Philadelphia International Airport

Philadelphia, PA, US

(IAD) Washington Dulles International Airport

Dulles, VA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
13
93%
Late
0
0%
Very Late
0
0%
Excessive
1
7%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
14
Total Delays ( > 1 min )
2
Codeshares
14
Average Delay (min.)
38
Standard Deviation
52.3
Min
0
Max
75

UA 4538 On-Time Performance Details

Overall Rating
3.6 of 5
Good
Percentage On-Time 93%
Average Delay Time 38 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 3.6 shows that this flight has on-time performance characteristics better than 70% of all other flights in the FlightStats database.
On-Time Performance Rating
4.8 of 5
Very Good
Percentage On-Time 93%
This flight has an on-time performance of 93%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 96% of other flights.
Delay Performance
2.3 of 5
Average
Average Delay Time 38 min
This flight has an average delay of 38 minutes with a standard deviation of 52.3 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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