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(UA) United Airlines 4389 On-Time Performance Rating

Date Range:

01-Jul-2026 to 31-Aug-2026

(BTV) Patrick Leahy Burlington International Airport

Burlington, VT, US

(IAD) Washington Dulles International Airport

Dulles, VA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
16
64%
Late
0
0%
Very Late
1
4%
Excessive
2
8%
Cancelled
2
8%
Diverted
4
16%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
21
Total Delays ( > 1 min )
6
Codeshares
21
Average Delay (min.)
59.833333333333336
Standard Deviation
82.2
Min
0
Max
212

UA 4389 On-Time Performance Details

Overall Rating
2.1 of 5
Average
Percentage On-Time 76%
Average Delay Time 59.833333333333336 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.1 shows that this flight has on-time performance characteristics better than 40% of all other flights in the FlightStats database.
On-Time Performance Rating
3.3 of 5
Average
Percentage On-Time 76%
This flight has an on-time performance of 76%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 66% of other flights.
Delay Performance
0.8 of 5
Poor
Average Delay Time 59.833333333333336 min
This flight has an average delay of 59.833333333333336 minutes with a standard deviation of 82.2 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 16% of other flights.

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