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Flight Reliability

WN 4504 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4504 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
3 min
Average arrival delay
0.3%
Cancelled
8 min early
Median arrival delay

Based on 286 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(48 flights)
  • Tue97%(32 flights)
  • Wed91%(33 flights)
  • Thu80%(51 flights)
  • Fri80%(50 flights)
  • Sat80%(25 flights)
  • Sun78%(46 flights)
On-time by departure window
  • 3–6 AM100%(24 flights)
  • 6–9 AM90%(117 flights)
  • 9 AM–12 PM80%(30 flights)
  • 12–3 PM76%(45 flights)
  • 3–6 PM89%(18 flights)
  • 6–9 PM66%(50 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
72%
May

Jun 90% → May 72% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%20
July 202586%21
August 202593%29
September 2025100%30
October 2025100%15
November 202569%36
December 202583%24
January 202675%12
February 202679%19
March 202673%40
April 202681%21
May 202672%18
Departures on time
80%
Diverted
0%
Flights flown
285
Months covered
12

Keep nerding

Based on 286 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.