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Flight Reliability

WN 509 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 509 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

73%
Arrive within 15 minutes
10 min
Average arrival delay
0.2%
Cancelled
3 min early
Median arrival delay

Based on 421 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(45 flights)
  • Tue79%(77 flights)
  • Wed78%(76 flights)
  • Thu73%(45 flights)
  • Fri74%(50 flights)
  • Sat71%(68 flights)
  • Sun58%(59 flights)
On-time by departure window
  • 6–9 AM100%(11 flights)
  • 9 AM–12 PM90%(112 flights)
  • 12–3 PM80%(153 flights)
  • 3–6 PM46%(92 flights)
  • 6–9 PM62%(52 flights)
On-time trend by month
79%
May

Jun 44% → May 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202544%46
July 202556%54
August 202584%32
September 202597%30
October 202557%35
November 202587%23
December 202547%19
January 202690%31
February 202692%24
March 202665%26
April 202694%48
May 202679%52
Departures on time
70%
Diverted
0%
Flights flown
420
Months covered
12

Keep nerding

Based on 421 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.