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(CZ) China Southern Airlines 1639 On-Time Performance Rating

Date Range:

01-Aug-2025 to 30-Sep-2025

(SFO) San Francisco International Airport

San Francisco, CA, US

(MIA) Miami International Airport

Miami, FL, US

On-Time Performance Chart

(using rounded numbers)
On-Time
30
83%
Late
2
6%
Very Late
3
8%
Excessive
0
0%
Cancelled
0
0%
Diverted
1
3%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
35
Total Delays ( > 1 min )
5
Codeshares
35
Average Delay (min.)
33
Standard Deviation
10.5
Min
0
Max
42

CZ 1639 On-Time Performance Details

Overall Rating
3.5 of 5
Average
Percentage On-Time 86%
Average Delay Time 33 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
4.7 of 5
Very Good
Percentage On-Time 86%
This flight has an on-time performance of 86%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 93% of other flights.
Delay Performance
2.3 of 5
Average
Average Delay Time 33 min
This flight has an average delay of 33 minutes with a standard deviation of 10.5 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 46% of other flights.