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Flight Reliability

WN 4338 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4338 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

75%
Arrive within 15 minutes
10 min
Average arrival delay
3.2%
Cancelled
2 min early
Median arrival delay

Based on 312 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon67%(51 flights)
  • Tue92%(38 flights)
  • Wed89%(35 flights)
  • Thu70%(47 flights)
  • Fri67%(54 flights)
  • Sat76%(37 flights)
  • Sun73%(40 flights)
On-time by departure window
  • 3–6 AM94%(47 flights)
  • 6–9 AM92%(71 flights)
  • 9 AM–12 PM77%(22 flights)
  • 12–3 PM48%(27 flights)
  • 3–6 PM79%(42 flights)
  • 6–9 PM58%(93 flights)
On-time trend by month
100%
May

Jun 59% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202559%27
July 202543%28
August 202585%27
September 202585%26
December 202536%11
January 202683%35
February 202667%58
March 202678%23
April 202689%28
May 2026100%30
Departures on time
72%
Diverted
0%
Flights flown
302
Months covered
12

Keep nerding

Based on 312 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.