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Flight Reliability

WN 31 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 31 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

86%
Arrive within 15 minutes
2 min early
Average arrival delay
0.4%
Cancelled
11 min early
Median arrival delay

Based on 234 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon100%(19 flights)
  • Tue86%(56 flights)
  • Wed89%(65 flights)
  • Thu95%(20 flights)
  • Fri85%(13 flights)
  • Sat71%(38 flights)
  • Sun86%(21 flights)
On-time by departure window
  • 6–9 AM—(6 flights)
  • 9 AM–12 PM96%(51 flights)
  • 12–3 PM84%(159 flights)
  • 3–6 PM75%(16 flights)
On-time trend by month
58%
May

Jun 91% → May 58% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202591%11
August 202560%10
October 202594%32
November 202593%14
December 202591%32
January 202698%57
February 202693%27
April 202642%12
May 202658%12
Departures on time
88%
Diverted
0.4%
Flights flown
232
Months covered
12

Keep nerding

Based on 234 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.