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Flight Reliability

WN 423 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 423 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

70%
Arrive within 15 minutes
19 min
Average arrival delay
1.2%
Cancelled
1 min
Median arrival delay

Based on 421 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon71%(65 flights)
  • Tue74%(58 flights)
  • Wed68%(60 flights)
  • Thu77%(66 flights)
  • Fri66%(65 flights)
  • Sat82%(39 flights)
  • Sun56%(61 flights)
On-time by departure window
  • 6–9 AM96%(51 flights)
  • 9 AM–12 PM82%(78 flights)
  • 12–3 PM87%(95 flights)
  • 3–6 PM49%(65 flights)
  • 6–9 PM45%(94 flights)
  • 9 PM–12 AM65%(31 flights)
On-time trend by month
41%
May

Jun 35% → May 41% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202535%34
July 202555%33
August 202581%32
September 202590%29
October 202560%45
November 2025100%29
December 202568%31
January 202687%31
February 202686%28
March 202680%50
April 202668%40
May 202641%32
Departures on time
62%
Diverted
0.5%
Flights flown
414
Months covered
12

Keep nerding

Based on 421 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.