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Flight Reliability

WN 439 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 439 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
9 min
Average arrival delay
0.5%
Cancelled
2 min early
Median arrival delay

Based on 368 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon63%(40 flights)
  • Tue96%(68 flights)
  • Wed89%(63 flights)
  • Thu78%(32 flights)
  • Fri55%(40 flights)
  • Sat63%(54 flights)
  • Sun72%(68 flights)
On-time by departure window
  • 3–6 AM88%(32 flights)
  • 6–9 AM93%(53 flights)
  • 9 AM–12 PM83%(36 flights)
  • 12–3 PM69%(87 flights)
  • 3–6 PM68%(66 flights)
  • 6–9 PM70%(90 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
85%
May

Jun 76% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%21
July 2025100%18
August 202576%37
September 202582%39
October 202588%32
November 202573%41
December 202551%55
January 202684%37
February 202662%21
March 202679%33
April 202683%18
May 202685%13
Departures on time
71%
Diverted
0.3%
Flights flown
365
Months covered
12

Keep nerding

Based on 368 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.