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Flight Reliability

WN 3766 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3766 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

66%
Arrive within 15 minutes
18 min
Average arrival delay
1.1%
Cancelled
6 min
Median arrival delay

Based on 264 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(29 flights)
  • Tue65%(43 flights)
  • Wed68%(40 flights)
  • Thu73%(22 flights)
  • Fri62%(26 flights)
  • Sat57%(47 flights)
  • Sun65%(54 flights)
On-time by departure window
  • 9 AM–12 PM—(1 flights)
  • 12–3 PM78%(85 flights)
  • 3–6 PM64%(115 flights)
  • 6–9 PM53%(30 flights)
  • 9 PM–12 AM50%(30 flights)
On-time trend by month
64%
May

Jun 70% → May 64% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%40
July 202556%45
October 202546%28
November 2025100%10
December 202559%22
January 202681%32
February 202682%28
March 202661%28
April 202658%12
May 202664%11
Departures on time
58%
Diverted
0%
Flights flown
261
Months covered
11

Keep nerding

Based on 264 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.