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Flight Reliability

WN 4 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4 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

93%
Arrive within 15 minutes
6 min early
Average arrival delay
1.6%
Cancelled
11 min early
Median arrival delay

Based on 314 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon92%(62 flights)
  • Tue91%(35 flights)
  • Wed94%(33 flights)
  • Thu92%(63 flights)
  • Fri94%(66 flights)
  • Sat—(8 flights)
  • Sun98%(42 flights)
On-time by departure window
  • 6–9 AM93%(290 flights)
  • 9 AM–12 PM91%(11 flights)
  • 12–3 PM—(8 flights)
On-time trend by month
95%
May

Jun 82% → May 95% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%28
July 202589%28
August 202583%29
September 202592%26
October 202596%49
November 202591%22
January 2026100%10
February 2026100%16
March 2026100%18
April 202694%35
May 202695%40
Departures on time
92%
Diverted
0%
Flights flown
309
Months covered
12

Keep nerding

Based on 314 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.