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Flight Reliability

WN 3138 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3138 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

74%
Arrive within 15 minutes
12 min
Average arrival delay
0.9%
Cancelled
1 min
Median arrival delay

Based on 319 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(46 flights)
  • Tue88%(50 flights)
  • Wed81%(48 flights)
  • Thu67%(43 flights)
  • Fri72%(43 flights)
  • Sat81%(31 flights)
  • Sun57%(53 flights)
On-time by departure window
  • 3–6 AM83%(18 flights)
  • 6–9 AM85%(116 flights)
  • 9 AM–12 PM78%(71 flights)
  • 12–3 PM—(4 flights)
  • 3–6 PM74%(27 flights)
  • 6–9 PM38%(56 flights)
  • 9 PM–12 AM86%(22 flights)
On-time trend by month
65%
May

Jun 50% → May 65% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202550%26
July 202559%29
August 202559%27
September 202577%30
October 202580%30
November 202577%30
December 202585%40
January 202685%27
February 202694%17
April 202679%24
May 202665%31
Departures on time
71%
Diverted
0.6%
Flights flown
314
Months covered
12

Keep nerding

Based on 319 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.