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Flight Reliability

WN 856 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 856 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

87%
Arrive within 15 minutes
1 min early
Average arrival delay
1.2%
Cancelled
7 min early
Median arrival delay

Based on 420 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon90%(62 flights)
  • Tue88%(59 flights)
  • Wed96%(53 flights)
  • Thu79%(58 flights)
  • Fri85%(54 flights)
  • Sat81%(59 flights)
  • Sun87%(69 flights)
On-time by departure window
  • 3–6 AM83%(24 flights)
  • 6–9 AM93%(151 flights)
  • 9 AM–12 PM89%(99 flights)
  • 12–3 PM84%(61 flights)
  • 3–6 PM86%(14 flights)
  • 6–9 PM72%(65 flights)
On-time trend by month
100%
May

Jun 90% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202594%31
August 202583%12
October 202597%34
November 202572%32
December 202572%29
January 202690%68
February 202679%67
March 202686%42
April 202690%31
May 2026100%30
Departures on time
85%
Diverted
0.2%
Flights flown
414
Months covered
12

Keep nerding

Based on 420 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.