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Flight Reliability

WN 397 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 397 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

85%
Arrive within 15 minutes
3 min early
Average arrival delay
0.8%
Cancelled
8 min early
Median arrival delay

Based on 357 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon83%(52 flights)
  • Tue90%(52 flights)
  • Wed94%(52 flights)
  • Thu79%(52 flights)
  • Fri84%(50 flights)
  • Sat91%(42 flights)
  • Sun78%(54 flights)
On-time by departure window
  • 3–6 AM98%(64 flights)
  • 6–9 AM98%(80 flights)
  • 9 AM–12 PM86%(49 flights)
  • 12–3 PM—(9 flights)
  • 3–6 PM77%(53 flights)
  • 6–9 PM62%(39 flights)
  • 9 PM–12 AM80%(60 flights)
On-time trend by month
85%
May

Jun 69% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%29
July 202557%30
August 202590%31
September 2025100%30
October 2025100%31
November 2025100%30
December 2025100%31
January 202690%30
February 202675%28
March 202671%31
April 202685%27
May 202685%26
Departures on time
78%
Diverted
0%
Flights flown
354
Months covered
12

Keep nerding

Based on 357 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.