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Flight Reliability

WN 1535 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1535 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

63%
Arrive within 15 minutes
16 min
Average arrival delay
1.6%
Cancelled
5 min
Median arrival delay

Based on 378 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon71%(59 flights)
  • Tue69%(52 flights)
  • Wed77%(53 flights)
  • Thu53%(58 flights)
  • Fri57%(58 flights)
  • Sat67%(36 flights)
  • Sun51%(53 flights)
On-time by departure window
  • 6–9 AM60%(30 flights)
  • 9 AM–12 PM73%(63 flights)
  • 12–3 PM50%(10 flights)
  • 3–6 PM71%(129 flights)
  • 6–9 PM54%(137 flights)
On-time trend by month
24%
May

Jun 59% → May 24% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202559%22
July 202552%21
August 202573%52
September 202567%57
October 202557%28
November 202569%32
December 202573%33
January 202683%30
February 202671%31
March 202657%28
April 202628%18
May 202624%17
Departures on time
61%
Diverted
0.8%
Flights flown
369
Months covered
12

Keep nerding

Based on 378 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.