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(UA) United Airlines 4578 On-Time Performance Rating

Date Range:

15-May-2026 to 15-Jul-2026

(TYS) Knoxville McGhee Tyson Airport

Knoxville, TN, US

(ORD) Chicago O'Hare International Airport

Chicago, IL, US

On-Time Performance Chart

(using rounded numbers)
On-Time
29
83%
Late
0
0%
Very Late
2
6%
Excessive
4
11%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
35
Total Delays ( > 1 min )
11
Codeshares
35
Average Delay (min.)
34.36363636363637
Standard Deviation
34.7
Min
0
Max
111

UA 4578 On-Time Performance Details

Overall Rating
3.5 of 5
Average
Percentage On-Time 83%
Average Delay Time 34.36363636363637 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 3.5 shows that this flight has on-time performance characteristics better than 69% of all other flights in the FlightStats database.
On-Time Performance Rating
4.3 of 5
Good
Percentage On-Time 83%
This flight has an on-time performance of 83%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 86% of other flights.
Delay Performance
2.7 of 5
Average
Average Delay Time 34.36363636363637 min
This flight has an average delay of 34.36363636363637 minutes with a standard deviation of 34.7 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 54% of other flights.

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