Skip to content
WanderNerd
Check a flight

Flight Reliability

WN 1581 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1581 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

72%
Arrive within 15 minutes
8 min
Average arrival delay
0.6%
Cancelled
1 min early
Median arrival delay

Based on 352 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon73%(51 flights)
  • Tue79%(52 flights)
  • Wed79%(52 flights)
  • Thu73%(52 flights)
  • Fri71%(51 flights)
  • Sat69%(42 flights)
  • Sun62%(50 flights)
On-time by departure window
  • 6–9 AM85%(104 flights)
  • 9 AM–12 PM70%(27 flights)
  • 12–3 PM—(8 flights)
  • 3–6 PM67%(89 flights)
  • 6–9 PM59%(88 flights)
  • 9 PM–12 AM79%(34 flights)
On-time trend by month
84%
May

Jun 100% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%30
July 2025100%31
August 202557%30
September 202573%30
October 202577%31
November 202552%27
December 202566%29
January 202672%29
February 202668%28
March 202674%27
April 202637%27
May 202684%31
Departures on time
73%
Diverted
0%
Flights flown
350
Months covered
12

Keep nerding

Based on 352 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.