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Flight Reliability

WN 4575 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4575 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

70%
Arrive within 15 minutes
10 min
Average arrival delay
1.8%
Cancelled
1 min
Median arrival delay

Based on 225 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon58%(31 flights)
  • Tue89%(36 flights)
  • Wed79%(38 flights)
  • Thu44%(32 flights)
  • Fri72%(32 flights)
  • Sat83%(24 flights)
  • Sun59%(27 flights)
On-time by departure window
  • 6–9 AM93%(28 flights)
  • 12–3 PM88%(88 flights)
  • 3–6 PM64%(67 flights)
  • 6–9 PM19%(37 flights)
On-time trend by month
19%
May

Jun 100% → May 19% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%26
July 202590%30
January 202680%39
February 202668%34
March 202667%30
April 202662%26
May 202619%26
Departures on time
65%
Diverted
0.4%
Flights flown
220
Months covered
10

Keep nerding

Based on 225 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.