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(UA) United Airlines 4539 On-Time Performance Rating

Date Range:

15-Dec-2025 to 15-Feb-2026

(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
44
79%
Late
2
4%
Very Late
3
5%
Excessive
1
2%
Cancelled
3
5%
Diverted
3
5%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
54
Total Delays ( > 1 min )
9
Codeshares
54
Average Delay (min.)
69.44444444444444
Standard Deviation
142.7
Min
0
Max
448

UA 4539 On-Time Performance Details

Overall Rating
2.3 of 5
Average
Percentage On-Time 82%
Average Delay Time 69.44444444444444 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.3 shows that this flight has on-time performance characteristics better than 44% of all other flights in the FlightStats database.
On-Time Performance Rating
4.4 of 5
Good
Percentage On-Time 82%
This flight has an on-time performance of 82%. 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
0.1 of 5
Very Poor
Average Delay Time 69.44444444444444 min
This flight has an average delay of 69.44444444444444 minutes with a standard deviation of 142.7 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 3% of other flights.

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