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Flight Reliability

WN 3817 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3817 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

66%
Arrive within 15 minutes
19 min
Average arrival delay
0%
Cancelled
1 min
Median arrival delay

Based on 258 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon66%(35 flights)
  • Tue63%(32 flights)
  • Wed65%(31 flights)
  • Thu61%(33 flights)
  • Fri68%(37 flights)
  • Sat80%(45 flights)
  • Sun55%(42 flights)
On-time by departure window
  • 6–9 AM—(5 flights)
  • 9 AM–12 PM61%(18 flights)
  • 12–3 PM75%(118 flights)
  • 3–6 PM54%(72 flights)
  • 6–9 PM54%(39 flights)
  • 9 PM–12 AM—(3 flights)
On-time trend by month
71%
May

Jun 54% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202554%28
July 202530%30
October 202586%29
November 202591%21
December 202568%19
January 202677%31
February 202668%28
April 202664%25
May 202671%31
Departures on time
64%
Diverted
1.2%
Flights flown
255
Months covered
11

Keep nerding

Based on 258 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.