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Flight Reliability

WN 540 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 540 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

77%
Arrive within 15 minutes
9 min
Average arrival delay
0.4%
Cancelled
4 min early
Median arrival delay

Based on 446 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon88%(65 flights)
  • Tue81%(73 flights)
  • Wed82%(71 flights)
  • Thu65%(63 flights)
  • Fri66%(68 flights)
  • Sat92%(38 flights)
  • Sun74%(65 flights)
On-time by departure window
  • 6–9 AM95%(74 flights)
  • 9 AM–12 PM83%(41 flights)
  • 12–3 PM72%(72 flights)
  • 3–6 PM65%(129 flights)
  • 6–9 PM81%(127 flights)
On-time trend by month
58%
May

Jun 69% → May 58% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%45
July 202565%48
August 202579%56
September 202581%57
October 202590%19
November 2025100%31
December 202585%40
January 202696%28
February 202667%27
March 202677%31
April 202673%30
May 202658%31
Departures on time
72%
Diverted
0.2%
Flights flown
443
Months covered
12

Keep nerding

Based on 446 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.