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(UA) United Airlines 4421 On-Time Performance Rating

Date Range:

01-Sep-2026 to 31-Oct-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
11
69%
Late
1
6%
Very Late
1
6%
Excessive
3
19%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
16
Total Delays ( > 1 min )
11
Codeshares
16
Average Delay (min.)
127
Standard Deviation
248.5
Min
0
Max
671

UA 4421 On-Time Performance Details

Overall Rating
0.5 of 5
Very Poor
Percentage On-Time 69%
Average Delay Time 127 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 0.5 shows that this flight has on-time performance characteristics better than 8% of all other flights in the FlightStats database.
On-Time Performance Rating
0.9 of 5
Poor
Percentage On-Time 69%
This flight has an on-time performance of 69%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 18% of other flights.
Delay Performance
0.0 of 5
Very Poor
Average Delay Time 127 min
This flight has an average delay of 127 minutes with a standard deviation of 248.5 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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