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(UA) United Airlines 4559 On-Time Performance Rating

Date Range:

15-Nov-2025 to 15-Jan-2026

(STL) St Louis Lambert International Airport

Saint Louis, MO, US

(ORD) Chicago O'Hare International Airport

Chicago, IL, US

On-Time Performance Chart

(using rounded numbers)
On-Time
3
38%
Late
2
25%
Very Late
0
0%
Excessive
3
38%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
8
Total Delays ( > 1 min )
6
Codeshares
8
Average Delay (min.)
60.333333333333336
Standard Deviation
64.2
Min
0
Max
182

UA 4559 On-Time Performance Details

Overall Rating
0.4 of 5
Very Poor
Percentage On-Time 38%
Average Delay Time 60.333333333333336 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
0.0 of 5
Very Poor
Percentage On-Time 38%
This flight has an on-time performance of 38%. 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
0.8 of 5
Poor
Average Delay Time 60.333333333333336 min
This flight has an average delay of 60.333333333333336 minutes with a standard deviation of 64.2 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 16% of other flights.

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