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Flight Reliability

WN 3727 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3727 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

66%
Arrive within 15 minutes
17 min
Average arrival delay
1.8%
Cancelled
1 min
Median arrival delay

Based on 334 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon57%(54 flights)
  • Tue76%(33 flights)
  • Wed65%(34 flights)
  • Thu66%(61 flights)
  • Fri72%(61 flights)
  • Sat64%(44 flights)
  • Sun61%(41 flights)
On-time by departure window
  • 3–6 AM93%(14 flights)
  • 6–9 AM85%(67 flights)
  • 9 AM–12 PM—(8 flights)
  • 12–3 PM71%(68 flights)
  • 3–6 PM54%(70 flights)
  • 6–9 PM76%(41 flights)
  • 9 PM–12 AM37%(60 flights)
On-time trend by month
56%
May

Jun 40% → May 56% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202540%30
July 202542%31
August 202558%31
September 202573%30
October 202560%63
November 202580%15
January 202690%10
February 2026100%14
March 202694%17
April 202687%38
May 202656%43
Departures on time
62%
Diverted
0%
Flights flown
328
Months covered
12

Keep nerding

Based on 334 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.