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(UA) United Airlines 1239 On-Time Performance Rating

Date Range:

01-Jul-2026 to 31-Aug-2026

(ORD) Chicago O'Hare International Airport

Chicago, IL, US

(ROC) Frederick Douglass Greater Rochester Intl Airport

Rochester, NY, US

On-Time Performance Chart

(using rounded numbers)
On-Time
42
71%
Late
7
12%
Very Late
2
3%
Excessive
5
8%
Cancelled
1
2%
Diverted
2
3%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
57
Total Delays ( > 1 min )
26
Codeshares
0
Average Delay (min.)
48.07692307692308
Standard Deviation
85.2
Min
0
Max
392

UA 1239 On-Time Performance Details

Overall Rating
1.7 of 5
Average
Percentage On-Time 74%
Average Delay Time 48.07692307692308 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 1.7 shows that this flight has on-time performance characteristics better than 33% of all other flights in the FlightStats database.
On-Time Performance Rating
2.7 of 5
Average
Percentage On-Time 74%
This flight has an on-time performance of 74%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 54% of other flights.
Delay Performance
0.7 of 5
Poor
Average Delay Time 48.07692307692308 min
This flight has an average delay of 48.07692307692308 minutes with a standard deviation of 85.2 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 14% of other flights.

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