(WN) Southwest Airlines 431 On-Time Performance Rating

Date Range:

15-Aug-2026 to 15-Oct-2026

(MDW) Chicago Midway International Airport

Chicago, IL, US

(PWM) Portland International Jetport

Portland, ME, US

On-Time Performance Chart

(using rounded numbers)

On-Time

68%

Late

20%

Very Late

Excessive

Cancelled

Diverted

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed

Total Delays ( > 1 min )

Codeshares

Average Delay (min.)

21.133333333333333

Standard Deviation

19.8

Min

Max

WN 431 On-Time Performance Details

Overall Rating

2.3 of 5

Average

Percentage On-Time 68%

Average Delay Time 21.133333333333333 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.3 shows that this flight has on-time performance characteristics better than 45% of all other flights in the FlightStats database.

On-Time Performance Rating

0.7 of 5

Poor

Percentage On-Time 68%

This flight has an on-time performance of 68%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 14% of other flights.

Delay Performance

3.9 of 5

Good

Average Delay Time 21.133333333333333 min

This flight has an average delay of 21.133333333333333 minutes with a standard deviation of 19.8 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 79% of other flights.