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Flight Reliability

WN 398 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 398 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
16 min
Average arrival delay
1.3%
Cancelled
4 min
Median arrival delay

Based on 469 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon52%(77 flights)
  • Tue70%(66 flights)
  • Wed71%(65 flights)
  • Thu61%(77 flights)
  • Fri66%(73 flights)
  • Sat73%(52 flights)
  • Sun73%(52 flights)
On-time by departure window
  • 6–9 AM97%(68 flights)
  • 9 AM–12 PM77%(109 flights)
  • 12–3 PM64%(105 flights)
  • 3–6 PM58%(113 flights)
  • 6–9 PM30%(67 flights)
On-time trend by month
94%
May

Jun 56% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202556%63
July 202537%65
August 202567%45
September 202542%43
October 202590%38
November 202567%30
December 202561%28
January 202687%31
February 202689%28
March 202657%30
April 202690%30
May 202694%31
Departures on time
63%
Diverted
0.2%
Flights flown
462
Months covered
12

Keep nerding

Based on 469 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.