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Flight Reliability

WN 366 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 366 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

90%
Arrive within 15 minutes
2 min early
Average arrival delay
0.9%
Cancelled
9 min early
Median arrival delay

Based on 426 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon95%(61 flights)
  • Tue84%(57 flights)
  • Wed75%(56 flights)
  • Thu100%(62 flights)
  • Fri94%(62 flights)
  • Sat88%(64 flights)
  • Sun92%(59 flights)
On-time by departure window
  • 3–6 AM—(9 flights)
  • 6–9 AM96%(188 flights)
  • 9 AM–12 PM85%(109 flights)
  • 12–3 PM84%(89 flights)
  • 3–6 PM88%(25 flights)
  • 6–9 PM—(1 flights)
On-time trend by month
88%
May

Jun 96% → May 88% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202596%25
July 202596%22
August 202594%31
September 202597%30
October 202574%39
November 202590%31
December 202584%31
February 2026100%18
March 202687%54
April 202694%65
May 202688%66
Departures on time
87%
Diverted
0.2%
Flights flown
421
Months covered
12

Keep nerding

Based on 426 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.