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Flight Reliability

WN 143 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 143 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

91%
Arrive within 15 minutes
4 min early
Average arrival delay
1.0%
Cancelled
9 min early
Median arrival delay

Based on 384 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon85%(54 flights)
  • Tue91%(56 flights)
  • Wed91%(57 flights)
  • Thu92%(52 flights)
  • Fri92%(51 flights)
  • Sat92%(51 flights)
  • Sun93%(59 flights)
On-time by departure window
  • 3–6 AM96%(23 flights)
  • 6–9 AM95%(130 flights)
  • 9 AM–12 PM88%(126 flights)
  • 12–3 PM93%(41 flights)
  • 3–6 PM89%(55 flights)
  • 6–9 PM—(3 flights)
  • 9 PM–12 AM—(2 flights)
On-time trend by month
100%
May

Jun 90% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202593%30
August 202596%28
September 202592%26
October 202593%27
November 202588%41
December 202587%54
January 202678%32
February 202696%28
March 202689%18
April 202693%30
May 2026100%36
Departures on time
90%
Diverted
0%
Flights flown
380
Months covered
12

Keep nerding

Based on 384 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.