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Flight Reliability

WN 643 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 643 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

84%
Arrive within 15 minutes
1 min early
Average arrival delay
1.3%
Cancelled
7 min early
Median arrival delay

Based on 400 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon86%(57 flights)
  • Tue74%(58 flights)
  • Wed82%(60 flights)
  • Thu91%(57 flights)
  • Fri80%(54 flights)
  • Sat93%(58 flights)
  • Sun80%(51 flights)
On-time by departure window
  • 3–6 AM94%(18 flights)
  • 6–9 AM91%(77 flights)
  • 9 AM–12 PM92%(141 flights)
  • 12–3 PM77%(79 flights)
  • 3–6 PM67%(15 flights)
  • 6–9 PM66%(65 flights)
On-time trend by month
94%
May

Jun 69% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%32
July 202585%33
August 202577%31
September 202569%29
October 202571%31
November 202583%36
December 202581%43
January 202694%31
February 202697%29
March 202684%31
April 2026100%33
May 202694%36
Departures on time
82%
Diverted
0%
Flights flown
395
Months covered
12

Keep nerding

Based on 400 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.