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(UA) United Airlines 4581 On-Time Performance Rating

Date Range:

15-Jul-2026 to 15-Sep-2026

(ORD) Chicago O'Hare International Airport

Chicago, IL, US

(STL) St Louis Lambert International Airport

Saint Louis, MO, US

On-Time Performance Chart

(using rounded numbers)
On-Time
20
80%
Late
1
4%
Very Late
1
4%
Excessive
2
8%
Cancelled
1
4%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
25
Total Delays ( > 1 min )
7
Codeshares
25
Average Delay (min.)
67
Standard Deviation
101.2
Min
0
Max
275

UA 4581 On-Time Performance Details

Overall Rating
2.2 of 5
Average
Percentage On-Time 80%
Average Delay Time 67 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.2 shows that this flight has on-time performance characteristics better than 42% of all other flights in the FlightStats database.
On-Time Performance Rating
3.9 of 5
Good
Percentage On-Time 80%
This flight has an on-time performance of 80%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 79% of other flights.
Delay Performance
0.4 of 5
Very Poor
Average Delay Time 67 min
This flight has an average delay of 67 minutes with a standard deviation of 101.2 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 8% of other flights.

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