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Flight Reliability

WN 1604 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1604 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

75%
Arrive within 15 minutes
15 min
Average arrival delay
0.9%
Cancelled
4 min early
Median arrival delay

Based on 423 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(71 flights)
  • Tue85%(60 flights)
  • Wed93%(59 flights)
  • Thu67%(72 flights)
  • Fri59%(71 flights)
  • Sat75%(36 flights)
  • Sun69%(49 flights)
On-time by departure window
  • 3–6 AM93%(28 flights)
  • 6–9 AM93%(86 flights)
  • 9 AM–12 PM82%(39 flights)
  • 12–3 PM70%(131 flights)
  • 3–6 PM71%(85 flights)
  • 6–9 PM51%(49 flights)
On-time trend by month
41%
May

Jun 52% → May 41% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202552%23
July 202562%21
August 202588%32
September 202597%31
October 202594%32
November 202591%32
December 202580%39
January 202694%49
February 202684%37
March 202668%25
April 202657%46
May 202641%51
Departures on time
72%
Diverted
0.2%
Flights flown
418
Months covered
12

Keep nerding

Based on 423 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.