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Flight Reliability

WN 4012 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4012 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

66%
Arrive within 15 minutes
16 min
Average arrival delay
1.8%
Cancelled
1 min early
Median arrival delay

Based on 332 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon59%(56 flights)
  • Tue78%(37 flights)
  • Wed71%(35 flights)
  • Thu64%(53 flights)
  • Fri56%(54 flights)
  • Sat72%(32 flights)
  • Sun70%(59 flights)
On-time by departure window
  • 6–9 AM86%(76 flights)
  • 9 AM–12 PM53%(59 flights)
  • 12–3 PM71%(49 flights)
  • 3–6 PM50%(30 flights)
  • 6–9 PM60%(96 flights)
  • 9 PM–12 AM69%(16 flights)
On-time trend by month
67%
May

Jun 29% → May 67% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202529%34
July 202555%33
August 202572%46
September 202563%46
October 202577%31
December 202573%11
January 202683%18
February 202680%10
March 202684%32
April 202663%30
May 202667%30
Departures on time
64%
Diverted
0%
Flights flown
326
Months covered
12

Keep nerding

Based on 332 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.