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Flight Reliability

WN 843 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 843 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

81%
Arrive within 15 minutes
5 min
Average arrival delay
1.6%
Cancelled
6 min early
Median arrival delay

Based on 426 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon78%(50 flights)
  • Tue82%(85 flights)
  • Wed89%(82 flights)
  • Thu78%(50 flights)
  • Fri71%(51 flights)
  • Sat82%(55 flights)
  • Sun82%(44 flights)
On-time by departure window
  • 3–6 AM96%(24 flights)
  • 6–9 AM97%(36 flights)
  • 9 AM–12 PM92%(26 flights)
  • 12–3 PM83%(162 flights)
  • 3–6 PM83%(90 flights)
  • 6–9 PM52%(66 flights)
  • 9 PM–12 AM92%(13 flights)
On-time trend by month
91%
May

Jun 31% → May 91% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202531%29
July 202542%31
August 202585%33
September 202589%35
October 202596%24
November 202586%43
December 202581%37
January 202697%31
February 202685%27
March 202676%37
April 2026100%45
May 202691%45
Departures on time
77%
Diverted
0.5%
Flights flown
417
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.