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(UA) United Airlines 4335 On-Time Performance Rating

Date Range:

01-May-2026 to 30-Jun-2026

(IAD) Washington Dulles International Airport

Dulles, VA, US

(BUF) Buffalo Niagara International Airport

Buffalo, NY, US

On-Time Performance Chart

(using rounded numbers)
On-Time
40
89%
Late
1
2%
Very Late
1
2%
Excessive
1
2%
Cancelled
1
2%
Diverted
1
2%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
44
Total Delays ( > 1 min )
9
Codeshares
44
Average Delay (min.)
18
Standard Deviation
24
Min
0
Max
77

UA 4335 On-Time Performance Details

Overall Rating
4.4 of 5
Good
Percentage On-Time 91%
Average Delay Time 18 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 4.4 shows that this flight has on-time performance characteristics better than 87% of all other flights in the FlightStats database.
On-Time Performance Rating
4.9 of 5
Very Good
Percentage On-Time 91%
This flight has an on-time performance of 91%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 99% of other flights.
Delay Performance
3.9 of 5
Good
Average Delay Time 18 min
This flight has an average delay of 18 minutes with a standard deviation of 24 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 79% of other flights.

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