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(UA) United Airlines 4539 On-Time Performance Rating

Date Range:

15-Mar-2026 to 15-May-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
40
87%
Late
0
0%
Very Late
1
2%
Excessive
4
9%
Cancelled
0
0%
Diverted
1
2%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
45
Total Delays ( > 1 min )
7
Codeshares
45
Average Delay (min.)
86.14285714285714
Standard Deviation
91.5
Min
0
Max
265

UA 4539 On-Time Performance Details

Overall Rating
2.4 of 5
Average
Percentage On-Time 89%
Average Delay Time 86.14285714285714 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.4 shows that this flight has on-time performance characteristics better than 47% of all other flights in the FlightStats database.
On-Time Performance Rating
4.8 of 5
Very Good
Percentage On-Time 89%
This flight has an on-time performance of 89%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 96% of other flights.
Delay Performance
0.0 of 5
Very Poor
Average Delay Time 86.14285714285714 min
This flight has an average delay of 86.14285714285714 minutes with a standard deviation of 91.5 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 0% of other flights.

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