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Flight Reliability

WN 4599 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4599 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

78%
Arrive within 15 minutes
6 min
Average arrival delay
1.2%
Cancelled
5 min early
Median arrival delay

Based on 323 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon71%(45 flights)
  • Tue81%(36 flights)
  • Wed86%(42 flights)
  • Thu84%(49 flights)
  • Fri80%(49 flights)
  • Sat80%(40 flights)
  • Sun71%(58 flights)
On-time by departure window
  • 3–6 AM91%(11 flights)
  • 6–9 AM95%(62 flights)
  • 9 AM–12 PM81%(21 flights)
  • 12–3 PM86%(22 flights)
  • 3–6 PM77%(110 flights)
  • 6–9 PM63%(68 flights)
  • 9 PM–12 AM68%(25 flights)
On-time trend by month
71%
May

Jun 88% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202588%25
July 202586%28
October 202550%26
November 202564%39
December 202592%26
January 202692%47
February 202678%37
March 202685%27
April 202672%29
May 202671%31
Departures on time
77%
Diverted
0%
Flights flown
319
Months covered
11

Keep nerding

Based on 323 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.