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Flight Reliability

WN 309 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 309 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

84%
Arrive within 15 minutes
2 min
Average arrival delay
1.1%
Cancelled
6 min early
Median arrival delay

Based on 537 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon91%(75 flights)
  • Tue86%(73 flights)
  • Wed87%(74 flights)
  • Thu87%(77 flights)
  • Fri84%(81 flights)
  • Sat73%(73 flights)
  • Sun82%(78 flights)
On-time by departure window
  • 3–6 AM100%(19 flights)
  • 6–9 AM95%(73 flights)
  • 9 AM–12 PM92%(185 flights)
  • 12–3 PM82%(81 flights)
  • 3–6 PM80%(70 flights)
  • 6–9 PM68%(63 flights)
  • 9 PM–12 AM60%(40 flights)
On-time trend by month
86%
May

Jun 83% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%36
July 202573%40
August 202590%52
September 202598%52
October 202582%28
November 202584%31
December 202561%31
January 202684%77
February 202680%86
March 202698%40
April 202683%30
May 202686%28
Departures on time
81%
Diverted
0%
Flights flown
531
Months covered
12

Keep nerding

Based on 537 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.