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Flight Reliability

WN 3221 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3221 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

73%
Arrive within 15 minutes
9 min
Average arrival delay
0.5%
Cancelled
2 min early
Median arrival delay

Based on 399 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon70%(59 flights)
  • Tue83%(52 flights)
  • Wed79%(53 flights)
  • Thu68%(56 flights)
  • Fri74%(57 flights)
  • Sat71%(49 flights)
  • Sun71%(69 flights)
On-time by departure window
  • 3–6 AM97%(31 flights)
  • 6–9 AM96%(51 flights)
  • 9 AM–12 PM—(9 flights)
  • 12–3 PM—(2 flights)
  • 3–6 PM77%(93 flights)
  • 6–9 PM63%(159 flights)
  • 9 PM–12 AM60%(50 flights)
On-time trend by month
90%
Mar

Jun 50% → Mar 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202550%34
July 202561%31
August 202584%55
September 202595%56
October 202539%49
November 202573%41
December 202560%35
January 202688%32
February 202690%19
March 202690%30
Departures on time
68%
Diverted
0.5%
Flights flown
395
Months covered
12

Keep nerding

Based on 399 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.