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(UA) United Airlines 8539 On-Time Performance Rating

Date Range:

15-Oct-2025 to 15-Dec-2025

(BOS) Boston Logan International Airport

Boston, MA, US

(YYZ) Toronto Pearson International Airport

Toronto, ON, CA

On-Time Performance Chart

(using rounded numbers)
On-Time
30
63%
Late
9
19%
Very Late
1
2%
Excessive
7
15%
Cancelled
1
2%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
48
Total Delays ( > 1 min )
23
Codeshares
48
Average Delay (min.)
44.82608695652174
Standard Deviation
62.4
Min
0
Max
299

UA 8539 On-Time Performance Details

Overall Rating
0.4 of 5
Very Poor
Percentage On-Time 63%
Average Delay Time 44.82608695652174 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 0.4 shows that this flight has on-time performance characteristics better than 7% of all other flights in the FlightStats database.
On-Time Performance Rating
0.1 of 5
Very Poor
Percentage On-Time 63%
This flight has an on-time performance of 63%. 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
0.7 of 5
Poor
Average Delay Time 44.82608695652174 min
This flight has an average delay of 44.82608695652174 minutes with a standard deviation of 62.4 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 14% of other flights.