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Flight Reliability

WN 4243 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4243 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

65%
Arrive within 15 minutes
13 min
Average arrival delay
0.4%
Cancelled
6 min
Median arrival delay

Based on 238 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon54%(41 flights)
  • Tue62%(21 flights)
  • Wed82%(17 flights)
  • Thu50%(38 flights)
  • Fri64%(44 flights)
  • Sat79%(33 flights)
  • Sun72%(43 flights)
On-time by departure window
  • 6–9 AM84%(25 flights)
  • 9 AM–12 PM65%(40 flights)
  • 12–3 PM56%(36 flights)
  • 3–6 PM84%(19 flights)
  • 6–9 PM60%(117 flights)
On-time trend by month
59%
May

Jun 46% → May 59% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202546%26
July 202568%31
August 202542%19
September 202582%17
December 202567%18
January 202671%31
February 202668%28
March 202679%24
April 202662%21
May 202659%22
Departures on time
62%
Diverted
0%
Flights flown
237
Months covered
10

Keep nerding

Based on 238 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.