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Flight Reliability

WN 331 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 331 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

78%
Arrive within 15 minutes
3 min
Average arrival delay
1.1%
Cancelled
4 min early
Median arrival delay

Based on 455 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(64 flights)
  • Tue74%(66 flights)
  • Wed78%(69 flights)
  • Thu80%(61 flights)
  • Fri77%(66 flights)
  • Sat77%(52 flights)
  • Sun81%(69 flights)
On-time by departure window
  • 3–6 AM—(2 flights)
  • 6–9 AM94%(34 flights)
  • 9 AM–12 PM92%(116 flights)
  • 12–3 PM73%(78 flights)
  • 3–6 PM81%(107 flights)
  • 6–9 PM59%(110 flights)
On-time trend by month
80%
May

Jun 81% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202581%62
July 202581%64
August 202555%29
September 202568%22
October 202576%37
November 202597%30
December 202590%31
January 202685%46
February 202681%37
March 202655%31
April 202679%28
May 202680%30
Departures on time
74%
Diverted
0.7%
Flights flown
447
Months covered
12

Keep nerding

Based on 455 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.