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Flight Reliability

WN 3504 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3504 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

87%
Arrive within 15 minutes
0 min
Average arrival delay
0.4%
Cancelled
6 min early
Median arrival delay

Based on 279 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon85%(48 flights)
  • Tue84%(31 flights)
  • Wed90%(31 flights)
  • Thu89%(47 flights)
  • Fri87%(45 flights)
  • Sat85%(26 flights)
  • Sun90%(49 flights)
On-time by departure window
  • 3–6 AM85%(13 flights)
  • 6–9 AM91%(45 flights)
  • 9 AM–12 PM95%(92 flights)
  • 12–3 PM—(4 flights)
  • 3–6 PM76%(88 flights)
  • 6–9 PM91%(35 flights)
On-time trend by month
89%
May

Jun 90% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%19
July 202589%18
August 202591%44
September 2025100%45
October 202584%32
November 202570%27
December 202593%29
March 202665%23
April 202689%18
May 202689%18
Departures on time
86%
Diverted
0.4%
Flights flown
277
Months covered
11

Keep nerding

Based on 279 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.