Skip to content
WanderNerd
Check a flight

Flight Reliability

WN 3915 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3915 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

88%
Arrive within 15 minutes
1 min
Average arrival delay
0.4%
Cancelled
3 min early
Median arrival delay

Based on 247 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon92%(36 flights)
  • Tue85%(26 flights)
  • Wed96%(27 flights)
  • Thu94%(35 flights)
  • Fri97%(35 flights)
  • Sat83%(41 flights)
  • Sun73%(44 flights)
On-time by departure window
  • 3–6 AM100%(27 flights)
  • 6–9 AM97%(75 flights)
  • 9 AM–12 PM67%(12 flights)
  • 12–3 PM87%(91 flights)
  • 3–6 PM69%(32 flights)
  • 6–9 PM—(7 flights)
On-time trend by month
100%
Mar

Jun 74% → Mar 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202574%23
July 202581%21
August 202587%30
September 2025100%30
October 202582%33
November 202581%31
December 202593%30
March 2026100%26
Departures on time
86%
Diverted
0.8%
Flights flown
244
Months covered
11

Keep nerding

Based on 247 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.