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(DL) Delta Air Lines 9521 On-Time Performance Rating

Date Range:

01-Jun-2026 to 31-Jul-2026

(FLR) Florence Peretola Airport

Florence, IT

(AMS) Amsterdam Schiphol Airport

Amsterdam, NL

On-Time Performance Chart

(using rounded numbers)
On-Time
28
82%
Late
2
6%
Very Late
2
6%
Excessive
0
0%
Cancelled
2
6%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
34
Total Delays ( > 1 min )
15
Codeshares
34
Average Delay (min.)
11.133333333333333
Standard Deviation
9.8
Min
0
Max
30

DL 9521 On-Time Performance Details

Overall Rating
4.7 of 5
Very Good
Percentage On-Time 82%
Average Delay Time 11.133333333333333 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 4.7 shows that this flight has on-time performance characteristics better than 92% of all other flights in the FlightStats database.
On-Time Performance Rating
4.5 of 5
Good
Percentage On-Time 82%
This flight has an on-time performance of 82%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 90% of other flights.
Delay Performance
4.8 of 5
Very Good
Average Delay Time 11.133333333333333 min
This flight has an average delay of 11.133333333333333 minutes with a standard deviation of 9.8 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 96% of other flights.

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