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(UA) United Airlines 4559 On-Time Performance Rating

Date Range:

01-Sep-2026 to 31-Oct-2026

(IAD) Washington Dulles International Airport

Dulles, VA, US

(DTW) Detroit Metropolitan Wayne County Airport

Detroit, MI, US

On-Time Performance Chart

(using rounded numbers)
On-Time
8
53%
Late
3
20%
Very Late
1
7%
Excessive
2
13%
Cancelled
0
0%
Diverted
1
7%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
14
Total Delays ( > 1 min )
9
Codeshares
14
Average Delay (min.)
36.77777777777778
Standard Deviation
40.6
Min
0
Max
129

UA 4559 On-Time Performance Details

Overall Rating
0.9 of 5
Poor
Percentage On-Time 57%
Average Delay Time 36.77777777777778 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 0.9 shows that this flight has on-time performance characteristics better than 17% of all other flights in the FlightStats database.
On-Time Performance Rating
0.1 of 5
Very Poor
Percentage On-Time 57%
This flight has an on-time performance of 57%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 3% of other flights.
Delay Performance
1.7 of 5
Average
Average Delay Time 36.77777777777778 min
This flight has an average delay of 36.77777777777778 minutes with a standard deviation of 40.6 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 34% of other flights.

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