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(UA) United Airlines 4539 On-Time Performance Rating

Date Range:

01-Nov-2025 to 31-Dec-2025

(ROA) Roanoke-Blacksburg Regional Airport

Roanoke, VA, US

(ORD) Chicago O'Hare International Airport

Chicago, IL, US

On-Time Performance Chart

(using rounded numbers)
On-Time
9
82%
Late
0
0%
Very Late
1
9%
Excessive
0
0%
Cancelled
0
0%
Diverted
1
9%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
10
Total Delays ( > 1 min )
2
Codeshares
10
Average Delay (min.)
19.5
Standard Deviation
20.5
Min
0
Max
34

UA 4539 On-Time Performance Details

Overall Rating
3.9 of 5
Good
Percentage On-Time 90%
Average Delay Time 19.5 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 3.9 shows that this flight has on-time performance characteristics better than 76% of all other flights in the FlightStats database.
On-Time Performance Rating
4.4 of 5
Good
Percentage On-Time 90%
This flight has an on-time performance of 90%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 88% of other flights.
Delay Performance
3.3 of 5
Average
Average Delay Time 19.5 min
This flight has an average delay of 19.5 minutes with a standard deviation of 20.5 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 66% of other flights.

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