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(UA) United Airlines 4387 On-Time Performance Rating

Date Range:

01-Aug-2026 to 30-Sep-2026

(IAD) Washington Dulles International Airport

Dulles, VA, US

(ROA) Roanoke-Blacksburg Regional Airport

Roanoke, VA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
12
75%
Late
0
0%
Very Late
2
13%
Excessive
2
13%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
16
Total Delays ( > 1 min )
6
Codeshares
16
Average Delay (min.)
37.833333333333336
Standard Deviation
35.2
Min
0
Max
94

UA 4387 On-Time Performance Details

Overall Rating
2.3 of 5
Average
Percentage On-Time 75%
Average Delay Time 37.833333333333336 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.3 shows that this flight has on-time performance characteristics better than 45% of all other flights in the FlightStats database.
On-Time Performance Rating
2.5 of 5
Average
Percentage On-Time 75%
This flight has an on-time performance of 75%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 50% of other flights.
Delay Performance
2.1 of 5
Average
Average Delay Time 37.833333333333336 min
This flight has an average delay of 37.833333333333336 minutes with a standard deviation of 35.2 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 42% of other flights.

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