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Flight Reliability

WN 2821 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 2821 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
3 min
Average arrival delay
0.9%
Cancelled
3 min early
Median arrival delay

Based on 336 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(54 flights)
  • Tue87%(37 flights)
  • Wed89%(35 flights)
  • Thu78%(49 flights)
  • Fri81%(47 flights)
  • Sat69%(39 flights)
  • Sun84%(68 flights)
On-time by departure window
  • 3–6 AM—(2 flights)
  • 6–9 AM93%(44 flights)
  • 9 AM–12 PM83%(75 flights)
  • 12–3 PM79%(71 flights)
  • 3–6 PM86%(55 flights)
  • 6–9 PM71%(82 flights)
On-time trend by month
87%
Apr

Jun 94% → Apr 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202594%35
July 202574%31
August 202594%17
September 202592%12
October 202582%39
November 202566%29
December 202574%31
January 202691%35
February 202685%26
March 202669%55
April 202687%15
Departures on time
75%
Diverted
1.2%
Flights flown
329
Months covered
12

Keep nerding

Based on 336 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.