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Flight Reliability

WN 1543 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1543 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

87%
Arrive within 15 minutes
1 min early
Average arrival delay
1.1%
Cancelled
8 min early
Median arrival delay

Based on 379 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon91%(56 flights)
  • Tue78%(51 flights)
  • Wed84%(51 flights)
  • Thu91%(54 flights)
  • Fri91%(53 flights)
  • Sat86%(62 flights)
  • Sun88%(48 flights)
On-time by departure window
  • 3–6 AM92%(143 flights)
  • 6–9 AM93%(88 flights)
  • 9 AM–12 PM90%(30 flights)
  • 12–3 PM—(1 flights)
  • 3–6 PM64%(25 flights)
  • 6–9 PM81%(79 flights)
  • 9 PM–12 AM—(9 flights)
On-time trend by month
90%
May

Jun 96% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202596%25
July 202596%24
August 202583%30
September 202583%30
October 202577%31
November 202591%32
December 202573%33
January 202687%37
February 202694%35
March 202683%36
April 202694%31
May 202690%31
Departures on time
88%
Diverted
0%
Flights flown
375
Months covered
12

Keep nerding

Based on 379 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.