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Flight Reliability

WN 478 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 478 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
5 min
Average arrival delay
1.3%
Cancelled
4 min early
Median arrival delay

Based on 374 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon83%(48 flights)
  • Tue87%(61 flights)
  • Wed82%(61 flights)
  • Thu85%(48 flights)
  • Fri80%(45 flights)
  • Sat77%(52 flights)
  • Sun85%(53 flights)
On-time by departure window
  • 3–6 AM91%(42 flights)
  • 6–9 AM87%(78 flights)
  • 9 AM–12 PM85%(60 flights)
  • 12–3 PM78%(36 flights)
  • 3–6 PM90%(38 flights)
  • 6–9 PM79%(80 flights)
  • 9 PM–12 AM68%(34 flights)
On-time trend by month
95%
May

Jun 83% → May 95% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%40
July 202581%43
August 202583%41
September 202585%39
October 202584%19
November 202582%27
December 202568%28
January 202696%26
February 202671%35
March 202684%31
April 202695%20
May 202695%19
Departures on time
78%
Diverted
0.3%
Flights flown
368
Months covered
12

Keep nerding

Based on 374 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.