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Flight Reliability

WN 1531 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1531 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

80%
Arrive within 15 minutes
8 min
Average arrival delay
0%
Cancelled
4 min early
Median arrival delay

Based on 371 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon82%(51 flights)
  • Tue78%(55 flights)
  • Wed69%(51 flights)
  • Thu80%(45 flights)
  • Fri79%(52 flights)
  • Sat90%(41 flights)
  • Sun81%(74 flights)
On-time by departure window
  • 6–9 AM94%(17 flights)
  • 9 AM–12 PM86%(21 flights)
  • 12–3 PM87%(133 flights)
  • 3–6 PM66%(106 flights)
  • 6–9 PM82%(85 flights)
  • 9 PM–12 AM—(7 flights)
On-time trend by month
88%
May

Jun 73% → May 88% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%37
July 202571%41
August 202556%27
September 202580%30
October 202589%27
November 202580%45
December 202586%42
January 202690%30
February 202670%27
March 202687%31
April 2026100%15
May 202688%17
Departures on time
74%
Diverted
0.5%
Flights flown
369
Months covered
12

Keep nerding

Based on 371 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.