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Flight Reliability

WN 4555 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4555 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

81%
Arrive within 15 minutes
3 min
Average arrival delay
0.5%
Cancelled
1 min early
Median arrival delay

Based on 189 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon84%(31 flights)
  • Tue83%(23 flights)
  • Wed87%(23 flights)
  • Thu64%(28 flights)
  • Fri87%(31 flights)
  • Sat83%(18 flights)
  • Sun82%(34 flights)
On-time by departure window
  • 3–6 AM100%(15 flights)
  • 6–9 AM91%(42 flights)
  • 9 AM–12 PM86%(29 flights)
  • 12–3 PM91%(42 flights)
  • 3–6 PM59%(22 flights)
  • 6–9 PM62%(37 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
96%
Mar

Oct 53% → Mar 96% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
October 202553%17
November 202574%39
December 202580%35
January 202691%32
February 202686%28
March 202696%27
Departures on time
74%
Diverted
0%
Flights flown
188
Months covered
8

Keep nerding

Based on 189 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.