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(UA) United Airlines 4539 On-Time Performance Rating

Date Range:

15-Dec-2025 to 15-Feb-2026

(ORD) Chicago O'Hare International Airport

Chicago, IL, US

(ATW) Appleton International Airport

Appleton, WI, US

On-Time Performance Chart

(using rounded numbers)
On-Time
2
33%
Late
2
33%
Very Late
0
0%
Excessive
2
33%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
6
Total Delays ( > 1 min )
4
Codeshares
6
Average Delay (min.)
56.75
Standard Deviation
38.5
Min
0
Max
91

UA 4539 On-Time Performance Details

Overall Rating
0.5 of 5
Very Poor
Percentage On-Time 33%
Average Delay Time 56.75 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 0.5 shows that this flight has on-time performance characteristics better than 8% of all other flights in the FlightStats database.
On-Time Performance Rating
0.0 of 5
Very Poor
Percentage On-Time 33%
This flight has an on-time performance of 33%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 1% of other flights.
Delay Performance
0.9 of 5
Poor
Average Delay Time 56.75 min
This flight has an average delay of 56.75 minutes with a standard deviation of 38.5 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 18% of other flights.

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