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Flight Reliability

WN 2851 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 2851 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
6 min early
Average arrival delay
2.0%
Cancelled
10 min early
Median arrival delay

Based on 294 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon87%(38 flights)
  • Tue97%(37 flights)
  • Wed94%(35 flights)
  • Thu84%(37 flights)
  • Fri94%(36 flights)
  • Sat90%(38 flights)
  • Sun88%(64 flights)
On-time by departure window
  • 6–9 AM89%(154 flights)
  • 9 AM–12 PM91%(21 flights)
  • 12–3 PM87%(31 flights)
  • 3–6 PM94%(70 flights)
  • 6–9 PM—(9 flights)
On-time trend by month
91%
Mar

Jun 79% → Mar 91% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%14
August 2025100%29
September 202593%30
October 202594%31
November 202582%28
December 202577%30
January 202694%35
February 202691%34
March 202691%32
Departures on time
88%
Diverted
1.0%
Flights flown
285
Months covered
12

Keep nerding

Based on 294 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.