Skip to content
WanderNerd
Check a flight

Flight Reliability

WN 820 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 820 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

76%
Arrive within 15 minutes
7 min
Average arrival delay
0.8%
Cancelled
3 min early
Median arrival delay

Based on 370 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon61%(44 flights)
  • Tue81%(52 flights)
  • Wed80%(54 flights)
  • Thu70%(47 flights)
  • Fri64%(47 flights)
  • Sat88%(60 flights)
  • Sun81%(63 flights)
On-time by departure window
  • 6–9 AM94%(47 flights)
  • 9 AM–12 PM91%(43 flights)
  • 12–3 PM80%(105 flights)
  • 3–6 PM58%(64 flights)
  • 6–9 PM69%(108 flights)
On-time trend by month
63%
May

Jun 95% → May 63% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202595%19
July 202595%19
August 202562%29
September 202573%30
October 202561%31
November 202584%31
December 202574%34
January 202687%31
February 202688%34
March 202669%39
April 202677%35
May 202663%35
Departures on time
72%
Diverted
0%
Flights flown
367
Months covered
12

Keep nerding

Based on 370 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.