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Flight Reliability

WN 644 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 644 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

72%
Arrive within 15 minutes
11 min
Average arrival delay
0.3%
Cancelled
1 min
Median arrival delay

Based on 364 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon69%(55 flights)
  • Tue90%(39 flights)
  • Wed92%(37 flights)
  • Thu70%(53 flights)
  • Fri73%(56 flights)
  • Sat70%(46 flights)
  • Sun59%(76 flights)
On-time by departure window
  • 3–6 AM100%(22 flights)
  • 6–9 AM85%(78 flights)
  • 9 AM–12 PM74%(23 flights)
  • 12–3 PM69%(99 flights)
  • 3–6 PM74%(62 flights)
  • 6–9 PM58%(66 flights)
  • 9 PM–12 AM42%(12 flights)
On-time trend by month
78%
May

Jun 64% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%28
July 202563%27
August 202592%36
September 202594%34
October 202572%57
November 202568%19
December 202573%15
January 202683%29
February 202679%28
March 202648%42
April 202654%24
May 202678%23
Departures on time
67%
Diverted
0.3%
Flights flown
362
Months covered
12

Keep nerding

Based on 364 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.