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Flight Reliability

WN 858 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 858 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

75%
Arrive within 15 minutes
10 min
Average arrival delay
1.6%
Cancelled
3 min early
Median arrival delay

Based on 373 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon73%(52 flights)
  • Tue81%(59 flights)
  • Wed86%(56 flights)
  • Thu60%(50 flights)
  • Fri61%(54 flights)
  • Sat87%(39 flights)
  • Sun75%(56 flights)
On-time by departure window
  • 3–6 AM96%(25 flights)
  • 6–9 AM100%(27 flights)
  • 9 AM–12 PM85%(78 flights)
  • 12–3 PM89%(27 flights)
  • 3–6 PM61%(69 flights)
  • 6–9 PM64%(86 flights)
  • 9 PM–12 AM65%(54 flights)
On-time trend by month
55%
May

Jun 67% → May 55% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%30
July 202569%32
August 202574%27
September 202575%24
October 202566%35
November 202582%28
December 202585%40
January 202691%32
February 202693%28
March 202655%29
April 202683%30
May 202655%31
Departures on time
71%
Diverted
0.3%
Flights flown
366
Months covered
12

Keep nerding

Based on 373 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.