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Flight Reliability

WN 921 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 921 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

77%
Arrive within 15 minutes
7 min
Average arrival delay
1.1%
Cancelled
3 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon69%(54 flights)
  • Tue82%(50 flights)
  • Wed88%(50 flights)
  • Thu63%(57 flights)
  • Fri79%(56 flights)
  • Sat79%(48 flights)
  • Sun80%(44 flights)
On-time by departure window
  • 6–9 AM88%(67 flights)
  • 9 AM–12 PM—(7 flights)
  • 12–3 PM89%(66 flights)
  • 3–6 PM56%(119 flights)
  • 6–9 PM83%(78 flights)
  • 9 PM–12 AM82%(22 flights)
On-time trend by month
94%
May

Jun 69% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%26
July 202557%21
August 202558%33
September 202555%31
October 202580%45
November 202597%29
December 202581%31
January 202690%29
February 202681%26
March 202663%27
April 202690%30
May 202694%31
Departures on time
73%
Diverted
0.5%
Flights flown
359
Months covered
12

Keep nerding

Based on 365 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.