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Flight Reliability

WN 3397 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3397 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
2 min
Average arrival delay
0.9%
Cancelled
6 min early
Median arrival delay

Based on 333 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon82%(50 flights)
  • Tue88%(48 flights)
  • Wed87%(46 flights)
  • Thu87%(47 flights)
  • Fri88%(49 flights)
  • Sat74%(31 flights)
  • Sun86%(58 flights)
On-time by departure window
  • 3–6 AM100%(46 flights)
  • 6–9 AM93%(56 flights)
  • 9 AM–12 PM94%(105 flights)
  • 12–3 PM80%(59 flights)
  • 3–6 PM59%(54 flights)
  • 6–9 PM—(8 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
100%
May

Jun 94% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202594%36
July 202588%41
August 202592%26
September 202596%26
November 202567%27
December 202552%31
January 202686%14
February 202668%19
March 202689%47
April 202694%32
May 2026100%25
Departures on time
82%
Diverted
0.3%
Flights flown
329
Months covered
12

Keep nerding

Based on 333 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.