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Flight Reliability

WN 4236 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4236 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

81%
Arrive within 15 minutes
2 min
Average arrival delay
0%
Cancelled
4 min early
Median arrival delay

Based on 238 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(31 flights)
  • Tue73%(30 flights)
  • Wed97%(30 flights)
  • Thu89%(28 flights)
  • Fri78%(37 flights)
  • Sat92%(37 flights)
  • Sun64%(45 flights)
On-time by departure window
  • 3–6 AM—(2 flights)
  • 6–9 AM94%(62 flights)
  • 9 AM–12 PM88%(50 flights)
  • 12–3 PM72%(47 flights)
  • 3–6 PM75%(57 flights)
  • 6–9 PM56%(16 flights)
  • 9 PM–12 AM—(4 flights)
On-time trend by month
33%
May

Jun 82% → May 33% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%28
July 2025100%25
August 202587%31
September 202587%30
November 202565%20
December 202563%16
March 202693%43
April 202685%20
May 202633%12
Departures on time
74%
Diverted
0%
Flights flown
238
Months covered
12

Keep nerding

Based on 238 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.