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Flight Reliability

WN 4238 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4238 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

77%
Arrive within 15 minutes
10 min
Average arrival delay
0%
Cancelled
1 min
Median arrival delay

Based on 178 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon76%(25 flights)
  • Tue92%(26 flights)
  • Wed85%(26 flights)
  • Thu63%(24 flights)
  • Fri64%(25 flights)
  • Sat80%(25 flights)
  • Sun78%(27 flights)
On-time by departure window
  • 9 AM–12 PM89%(63 flights)
  • 3–6 PM72%(101 flights)
  • 6–9 PM62%(13 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
74%
May

Aug 92% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 202592%24
September 202585%26
November 202575%28
December 202568%31
April 202663%24
May 202674%31
Departures on time
74%
Diverted
0%
Flights flown
178
Months covered
10

Keep nerding

Based on 178 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.