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Flight Reliability

WN 855 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 855 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

83%
Arrive within 15 minutes
3 min
Average arrival delay
0.7%
Cancelled
6 min early
Median arrival delay

Based on 412 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon86%(56 flights)
  • Tue86%(59 flights)
  • Wed86%(57 flights)
  • Thu78%(58 flights)
  • Fri86%(59 flights)
  • Sat84%(38 flights)
  • Sun78%(82 flights)
On-time by departure window
  • 6–9 AM88%(147 flights)
  • 9 AM–12 PM84%(163 flights)
  • 12–3 PM73%(48 flights)
  • 3–6 PM72%(47 flights)
  • 6–9 PM—(4 flights)
On-time trend by month
81%
May

Jun 69% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%29
July 202583%35
August 202587%31
September 202580%30
October 202582%56
November 202598%40
December 202587%30
January 202688%24
February 202683%24
March 202672%39
April 202689%35
May 202681%36
Departures on time
79%
Diverted
0%
Flights flown
409
Months covered
12

Keep nerding

Based on 412 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.