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(UA) United Airlines 9821 On-Time Performance Rating

Date Range:

01-Mar-2026 to 30-Apr-2026

(VIE) Vienna International Airport

Vienna, AT

(IAD) Washington Dulles International Airport

Dulles, VA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
53
87%
Late
3
5%
Very Late
1
2%
Excessive
1
2%
Cancelled
3
5%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
61
Total Delays ( > 1 min )
27
Codeshares
61
Average Delay (min.)
10.333333333333334
Standard Deviation
10.3
Min
0
Max
49

UA 9821 On-Time Performance Details

Overall Rating
4.8 of 5
Very Good
Percentage On-Time 87%
Average Delay Time 10.333333333333334 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 4.8 shows that this flight has on-time performance characteristics better than 95% of all other flights in the FlightStats database.
On-Time Performance Rating
4.7 of 5
Very Good
Percentage On-Time 87%
This flight has an on-time performance of 87%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 95% of other flights.
Delay Performance
4.9 of 5
Very Good
Average Delay Time 10.333333333333334 min
This flight has an average delay of 10.333333333333334 minutes with a standard deviation of 10.3 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 97% of other flights.