background

(OZ) Asiana Airlines 9521 On-Time Performance Rating

Date Range:

15-Oct-2025 to 15-Dec-2025

(SFO) San Francisco International Airport

San Francisco, CA, US

(IAH) Houston George Bush Intercontinental Airport

Houston, TX, US

On-Time Performance Chart

(using rounded numbers)
On-Time
47
84%
Late
2
4%
Very Late
3
5%
Excessive
4
7%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
56
Total Delays ( > 1 min )
13
Codeshares
56
Average Delay (min.)
38.46153846153846
Standard Deviation
32.5
Min
0
Max
111

OZ 9521 On-Time Performance Details

Overall Rating
3.2 of 5
Average
Percentage On-Time 84%
Average Delay Time 38.46153846153846 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 3.2 shows that this flight has on-time performance characteristics better than 62% of all other flights in the FlightStats database.
On-Time Performance Rating
4.6 of 5
Very Good
Percentage On-Time 84%
This flight has an on-time performance of 84%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 92% of other flights.
Delay Performance
1.7 of 5
Average
Average Delay Time 38.46153846153846 min
This flight has an average delay of 38.46153846153846 minutes with a standard deviation of 32.5 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 34% of other flights.