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(UA) United Airlines 4521 On-Time Performance Rating

Date Range:

15-Nov-2025 to 15-Jan-2026

(ORD) Chicago O'Hare International Airport

Chicago, IL, US

(TYS) Knoxville McGhee Tyson Airport

Knoxville, TN, US

On-Time Performance Chart

(using rounded numbers)
On-Time
14
70%
Late
0
0%
Very Late
1
5%
Excessive
4
20%
Cancelled
0
0%
Diverted
1
5%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
19
Total Delays ( > 1 min )
7
Codeshares
19
Average Delay (min.)
127.71428571428571
Standard Deviation
174.4
Min
0
Max
504

UA 4521 On-Time Performance Details

Overall Rating
1.4 of 5
Poor
Percentage On-Time 74%
Average Delay Time 127.71428571428571 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 1.4 shows that this flight has on-time performance characteristics better than 26% 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
0.0 of 5
Very Poor
Average Delay Time 127.71428571428571 min
This flight has an average delay of 127.71428571428571 minutes with a standard deviation of 174.4 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 0% of other flights.

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