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(WN) Southwest Airlines 4255 On-Time Performance Rating

Date Range:

15-Mar-2026 to 15-May-2026

(SJC) San Jose Mineta International Airport

San Jose, CA, US

(ONT) Ontario International Airport

Ontario, CA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
41
75%
Late
8
15%
Very Late
3
5%
Excessive
3
5%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
55
Total Delays ( > 1 min )
31
Codeshares
0
Average Delay (min.)
20.774193548387096
Standard Deviation
28.4
Min
0
Max
154

WN 4255 On-Time Performance Details

Overall Rating
2.6 of 5
Average
Percentage On-Time 75%
Average Delay Time 20.774193548387096 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.6 shows that this flight has on-time performance characteristics better than 50% of all other flights in the FlightStats database.
On-Time Performance Rating
0.9 of 5
Poor
Percentage On-Time 75%
This flight has an on-time performance of 75%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 18% of other flights.
Delay Performance
4.2 of 5
Good
Average Delay Time 20.774193548387096 min
This flight has an average delay of 20.774193548387096 minutes with a standard deviation of 28.4 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 84% of other flights.

Other Stops for WN 4255