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(WN) Southwest Airlines 4128 On-Time Performance Rating

Date Range:

15-Mar-2026 to 15-May-2026

(DEN) Denver International Airport

Denver, CO, US

(SLC) Salt Lake City International Airport

Salt Lake City, UT, US

On-Time Performance Chart

(using rounded numbers)
On-Time
11
92%
Late
0
0%
Very Late
0
0%
Excessive
1
8%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
12
Total Delays ( > 1 min )
6
Codeshares
0
Average Delay (min.)
38.833333333333336
Standard Deviation
78.5
Min
0
Max
199

WN 4128 On-Time Performance Details

Overall Rating
3.0 of 5
Average
Percentage On-Time 92%
Average Delay Time 38.833333333333336 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 3 shows that this flight has on-time performance characteristics better than 59% of all other flights in the FlightStats database.
On-Time Performance Rating
4.3 of 5
Good
Percentage On-Time 92%
This flight has an on-time performance of 92%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 86% of other flights.
Delay Performance
1.7 of 5
Average
Average Delay Time 38.833333333333336 min
This flight has an average delay of 38.833333333333336 minutes with a standard deviation of 78.5 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 34% of other flights.

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