Skip to content
WanderNerd
Check a flight

Flight Reliability

WN 1540 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1540 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

83%
Arrive within 15 minutes
2 min
Average arrival delay
1.3%
Cancelled
5 min early
Median arrival delay

Based on 458 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon83%(71 flights)
  • Tue84%(61 flights)
  • Wed79%(61 flights)
  • Thu90%(71 flights)
  • Fri87%(75 flights)
  • Sat73%(64 flights)
  • Sun82%(49 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM96%(96 flights)
  • 9 AM–12 PM87%(106 flights)
  • 12–3 PM80%(141 flights)
  • 3–6 PM71%(87 flights)
  • 6–9 PM67%(21 flights)
On-time trend by month
55%
May

Jun 87% → May 55% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%31
July 202583%36
August 202587%82
September 202592%90
October 202569%32
November 202574%19
December 202580%15
January 202693%28
February 202689%27
March 202684%31
April 202673%30
May 202655%31
Departures on time
78%
Diverted
0%
Flights flown
452
Months covered
12

Keep nerding

Based on 458 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.