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Flight Reliability

WN 661 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 661 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

77%
Arrive within 15 minutes
9 min
Average arrival delay
2.5%
Cancelled
1 min
Median arrival delay

Based on 361 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon73%(44 flights)
  • Tue80%(45 flights)
  • Wed93%(44 flights)
  • Thu72%(47 flights)
  • Fri80%(49 flights)
  • Sat70%(64 flights)
  • Sun75%(56 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM99%(71 flights)
  • 9 AM–12 PM86%(42 flights)
  • 12–3 PM80%(122 flights)
  • 3–6 PM66%(64 flights)
  • 6–9 PM26%(19 flights)
  • 9 PM–12 AM60%(30 flights)
On-time trend by month
97%
May

Jun 73% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%30
July 202581%32
August 202572%29
September 202570%30
October 202546%39
November 202586%21
December 202590%20
January 202693%30
February 202671%28
March 202668%28
April 202690%30
May 202697%32
Departures on time
74%
Diverted
0.8%
Flights flown
349
Months covered
12

Keep nerding

Based on 361 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.