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(UA) United Airlines 9821 On-Time Performance Rating

Date Range:

15-Jan-2026 to 15-Mar-2026

(VIE) Vienna International Airport

Vienna, AT

(IAD) Washington Dulles International Airport

Dulles, VA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
36
75%
Late
6
13%
Very Late
3
6%
Excessive
1
2%
Cancelled
2
4%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
48
Total Delays ( > 1 min )
18
Codeshares
48
Average Delay (min.)
19.5
Standard Deviation
19.7
Min
0
Max
87

UA 9821 On-Time Performance Details

Overall Rating
3.2 of 5
Average
Percentage On-Time 75%
Average Delay Time 19.5 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 3.2 shows that this flight has on-time performance characteristics better than 62% of all other flights in the FlightStats database.
On-Time Performance Rating
2.1 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 42% of other flights.
Delay Performance
4.2 of 5
Good
Average Delay Time 19.5 min
This flight has an average delay of 19.5 minutes with a standard deviation of 19.7 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 84% of other flights.