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Flight Reliability

WN 1721 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1721 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

69%
Arrive within 15 minutes
14 min
Average arrival delay
0.6%
Cancelled
0 min
Median arrival delay

Based on 345 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon66%(53 flights)
  • Tue76%(38 flights)
  • Wed74%(35 flights)
  • Thu47%(51 flights)
  • Fri66%(55 flights)
  • Sat88%(49 flights)
  • Sun73%(59 flights)
On-time by departure window
  • 3–6 AM—(5 flights)
  • 6–9 AM83%(53 flights)
  • 9 AM–12 PM83%(109 flights)
  • 12–3 PM71%(41 flights)
  • 3–6 PM71%(52 flights)
  • 6–9 PM39%(74 flights)
  • 9 PM–12 AM—(6 flights)
On-time trend by month
100%
Apr

Jun 69% → Apr 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%29
July 202583%29
August 202537%41
September 202550%42
October 202562%26
November 202596%23
December 202588%17
January 202665%26
February 202674%27
March 202679%66
April 2026100%14
Departures on time
66%
Diverted
0.9%
Flights flown
340
Months covered
11

Keep nerding

Based on 345 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.