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Flight Reliability

WN 578 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 578 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

77%
Arrive within 15 minutes
8 min
Average arrival delay
0.2%
Cancelled
1 min early
Median arrival delay

Based on 432 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(61 flights)
  • Tue95%(63 flights)
  • Wed85%(65 flights)
  • Thu63%(62 flights)
  • Fri70%(63 flights)
  • Sat72%(54 flights)
  • Sun69%(61 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM94%(54 flights)
  • 9 AM–12 PM83%(47 flights)
  • 12–3 PM69%(67 flights)
  • 3–6 PM73%(198 flights)
  • 6–9 PM75%(44 flights)
  • 9 PM–12 AM78%(18 flights)
On-time trend by month
53%
May

Jun 70% → May 53% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%30
July 202571%31
August 202577%31
September 202567%30
October 202597%31
November 202564%28
December 202583%29
January 202687%47
February 202674%43
March 202683%57
April 202682%38
May 202653%34
Departures on time
71%
Diverted
0.5%
Flights flown
429
Months covered
12

Keep nerding

Based on 432 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.