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Flight Reliability

WN 428 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 428 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

76%
Arrive within 15 minutes
11 min
Average arrival delay
1.0%
Cancelled
4 min early
Median arrival delay

Based on 492 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon71%(79 flights)
  • Tue81%(57 flights)
  • Wed72%(60 flights)
  • Thu71%(89 flights)
  • Fri80%(85 flights)
  • Sat85%(58 flights)
  • Sun76%(59 flights)
On-time by departure window
  • 3–6 AM97%(68 flights)
  • 6–9 AM96%(44 flights)
  • 9 AM–12 PM85%(100 flights)
  • 12–3 PM74%(109 flights)
  • 3–6 PM64%(136 flights)
  • 6–9 PM30%(30 flights)
On-time trend by month
67%
May

Jun 65% → May 67% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202565%26
July 202567%27
August 202585%34
September 202591%34
October 2025100%31
November 202560%42
December 202574%49
January 202685%27
February 202696%25
March 202680%39
April 202671%72
May 202667%81
Departures on time
70%
Diverted
0%
Flights flown
487
Months covered
12

Keep nerding

Based on 492 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.