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Flight Reliability

WN 3739 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3739 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

76%
Arrive within 15 minutes
8 min
Average arrival delay
2.8%
Cancelled
0 min
Median arrival delay

Based on 218 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon88%(25 flights)
  • Tue77%(31 flights)
  • Wed69%(29 flights)
  • Thu68%(25 flights)
  • Fri77%(30 flights)
  • Sat79%(34 flights)
  • Sun74%(38 flights)
On-time by departure window
  • 6–9 AM70%(20 flights)
  • 9 AM–12 PM72%(36 flights)
  • 12–3 PM—(1 flights)
  • 3–6 PM82%(27 flights)
  • 6–9 PM83%(42 flights)
  • 9 PM–12 AM73%(86 flights)
On-time trend by month
68%
May

Jun 56% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202556%16
July 202574%19
August 202586%29
September 202583%30
October 202574%19
December 202582%11
March 202686%21
April 202670%30
May 202668%31
Departures on time
65%
Diverted
0%
Flights flown
212
Months covered
11

Keep nerding

Based on 218 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.