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(UA) United Airlines 1239 On-Time Performance Rating

Date Range:

01-May-2026 to 30-Jun-2026

(ATL) Atlanta Hartsfield-Jackson International Airport

Atlanta, GA, US

(ORD) Chicago O'Hare International Airport

Chicago, IL, US

On-Time Performance Chart

(using rounded numbers)
On-Time
33
77%
Late
6
14%
Very Late
2
5%
Excessive
1
2%
Cancelled
0
0%
Diverted
1
2%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
42
Total Delays ( > 1 min )
15
Codeshares
0
Average Delay (min.)
20.333333333333332
Standard Deviation
20
Min
0
Max
79

UA 1239 On-Time Performance Details

Overall Rating
3.6 of 5
Good
Percentage On-Time 79%
Average Delay Time 20.333333333333332 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 3.6 shows that this flight has on-time performance characteristics better than 71% of all other flights in the FlightStats database.
On-Time Performance Rating
3.1 of 5
Average
Percentage On-Time 79%
This flight has an on-time performance of 79%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 62% of other flights.
Delay Performance
4.1 of 5
Good
Average Delay Time 20.333333333333332 min
This flight has an average delay of 20.333333333333332 minutes with a standard deviation of 20 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 82% of other flights.

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