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Flight Reliability

WN 558 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 558 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

73%
Arrive within 15 minutes
13 min
Average arrival delay
0%
Cancelled
1 min early
Median arrival delay

Based on 380 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(49 flights)
  • Tue80%(54 flights)
  • Wed83%(52 flights)
  • Thu60%(48 flights)
  • Fri61%(51 flights)
  • Sat76%(58 flights)
  • Sun74%(68 flights)
On-time by departure window
  • 3–6 AM97%(32 flights)
  • 6–9 AM100%(45 flights)
  • 9 AM–12 PM—(1 flights)
  • 12–3 PM74%(96 flights)
  • 3–6 PM60%(94 flights)
  • 6–9 PM80%(70 flights)
  • 9 PM–12 AM45%(42 flights)
On-time trend by month
60%
May

Jun 68% → May 60% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%41
July 202549%45
August 202581%32
September 2025100%30
October 202577%39
November 202577%22
December 202577%17
January 202690%30
February 202672%25
March 202671%31
April 202676%33
May 202660%35
Departures on time
70%
Diverted
0%
Flights flown
380
Months covered
12

Keep nerding

Based on 380 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.