Skip to content
WanderNerd
Check a flight

Flight Reliability

WN 427 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 427 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

67%
Arrive within 15 minutes
13 min
Average arrival delay
0.7%
Cancelled
0 min
Median arrival delay

Based on 405 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon61%(67 flights)
  • Tue82%(44 flights)
  • Wed77%(43 flights)
  • Thu63%(67 flights)
  • Fri58%(71 flights)
  • Sat75%(57 flights)
  • Sun64%(53 flights)
On-time by departure window
  • 6–9 AM95%(42 flights)
  • 9 AM–12 PM84%(37 flights)
  • 12–3 PM57%(100 flights)
  • 3–6 PM81%(57 flights)
  • 6–9 PM56%(146 flights)
  • 9 PM–12 AM70%(20 flights)
On-time trend by month
36%
May

Jun 70% → May 36% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%30
July 202569%35
August 202581%53
September 202584%55
October 202571%14
November 202552%21
December 202535%17
January 202682%28
February 202678%27
March 202662%37
April 202663%41
May 202636%44
Departures on time
62%
Diverted
0%
Flights flown
402
Months covered
12

Keep nerding

Based on 405 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.