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Flight Reliability

WN 555 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 555 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

74%
Arrive within 15 minutes
13 min
Average arrival delay
0.2%
Cancelled
2 min early
Median arrival delay

Based on 421 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon67%(60 flights)
  • Tue81%(63 flights)
  • Wed92%(65 flights)
  • Thu73%(63 flights)
  • Fri74%(58 flights)
  • Sat82%(34 flights)
  • Sun56%(75 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM93%(43 flights)
  • 9 AM–12 PM84%(85 flights)
  • 12–3 PM84%(85 flights)
  • 3–6 PM66%(92 flights)
  • 6–9 PM69%(45 flights)
  • 9 PM–12 AM52%(67 flights)
On-time trend by month
66%
May

Jun 67% → May 66% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%36
July 202571%34
August 202569%35
September 202571%34
October 202584%62
November 202578%36
December 202578%41
January 202667%30
February 202664%25
March 202682%27
April 202686%29
May 202666%29
Departures on time
70%
Diverted
0.5%
Flights flown
418
Months covered
12

Keep nerding

Based on 421 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.