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Flight Reliability

WN 4439 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4439 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

79%
Arrive within 15 minutes
7 min
Average arrival delay
0%
Cancelled
4 min early
Median arrival delay

Based on 214 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon77%(31 flights)
  • Tue91%(21 flights)
  • Wed95%(21 flights)
  • Thu77%(31 flights)
  • Fri73%(33 flights)
  • Sat85%(34 flights)
  • Sun67%(43 flights)
On-time by departure window
  • 6–9 AM97%(89 flights)
  • 9 AM–12 PM94%(18 flights)
  • 12–3 PM75%(52 flights)
  • 6–9 PM49%(55 flights)
On-time trend by month
45%
May

Aug 96% → May 45% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 202596%22
September 202592%25
October 2025100%12
November 202589%28
December 202597%31
March 202659%17
April 202661%28
May 202645%31
Departures on time
73%
Diverted
0%
Flights flown
214
Months covered
12

Keep nerding

Based on 214 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.