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Flight Reliability

WN 4055 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4055 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

67%
Arrive within 15 minutes
16 min
Average arrival delay
1.9%
Cancelled
6 min
Median arrival delay

Based on 207 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon75%(24 flights)
  • Tue53%(32 flights)
  • Wed57%(30 flights)
  • Thu79%(24 flights)
  • Fri59%(29 flights)
  • Sat82%(34 flights)
  • Sun67%(30 flights)
On-time by departure window
  • 6–9 AM—(9 flights)
  • 9 AM–12 PM—(5 flights)
  • 12–3 PM70%(89 flights)
  • 3–6 PM61%(98 flights)
  • 6–9 PM—(2 flights)
On-time trend by month
62%
May

Oct 74% → May 62% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
October 202574%35
November 202574%19
December 202563%19
April 202666%50
May 202662%58
Departures on time
61%
Diverted
0%
Flights flown
203
Months covered
10

Keep nerding

Based on 207 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.