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Flight Reliability

WN 636 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 636 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

69%
Arrive within 15 minutes
17 min
Average arrival delay
0.5%
Cancelled
2 min
Median arrival delay

Based on 391 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon68%(50 flights)
  • Tue60%(63 flights)
  • Wed50%(62 flights)
  • Thu73%(51 flights)
  • Fri77%(53 flights)
  • Sat81%(58 flights)
  • Sun75%(52 flights)
On-time by departure window
  • 6–9 AM90%(48 flights)
  • 9 AM–12 PM82%(65 flights)
  • 12–3 PM77%(64 flights)
  • 3–6 PM60%(96 flights)
  • 6–9 PM46%(74 flights)
  • 9 PM–12 AM71%(42 flights)
On-time trend by month
71%
May

Jun 52% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202552%52
July 202548%65
August 202564%28
September 202584%25
October 202574%35
November 202571%28
December 202568%31
February 202688%25
March 202680%30
April 202690%30
May 202671%31
Departures on time
61%
Diverted
0%
Flights flown
389
Months covered
12

Keep nerding

Based on 391 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.