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Flight Reliability

WN 1643 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1643 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

75%
Arrive within 15 minutes
10 min
Average arrival delay
1.0%
Cancelled
2 min early
Median arrival delay

Based on 421 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon64%(58 flights)
  • Tue83%(60 flights)
  • Wed75%(52 flights)
  • Thu81%(47 flights)
  • Fri81%(59 flights)
  • Sat76%(70 flights)
  • Sun66%(70 flights)
On-time by departure window
  • 3–6 AM—(9 flights)
  • 6–9 AM88%(106 flights)
  • 9 AM–12 PM94%(51 flights)
  • 12–3 PM74%(87 flights)
  • 3–6 PM59%(105 flights)
  • 6–9 PM60%(58 flights)
On-time trend by month
73%
May

Jun 55% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202555%29
July 202550%30
August 202582%34
September 202591%34
November 202591%46
December 202560%75
January 202683%40
February 2026100%28
March 202684%31
April 202657%30
May 202673%30
Departures on time
70%
Diverted
0.2%
Flights flown
416
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.