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Flight Reliability

WN 3899 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3899 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

83%
Arrive within 15 minutes
2 min
Average arrival delay
1.4%
Cancelled
9 min early
Median arrival delay

Based on 358 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon84%(56 flights)
  • Tue88%(48 flights)
  • Wed88%(50 flights)
  • Thu75%(60 flights)
  • Fri78%(59 flights)
  • Sat91%(32 flights)
  • Sun83%(48 flights)
On-time by departure window
  • 3–6 AM—(4 flights)
  • 6–9 AM100%(99 flights)
  • 9 AM–12 PM97%(88 flights)
  • 12–3 PM88%(25 flights)
  • 3–6 PM57%(42 flights)
  • 6–9 PM67%(63 flights)
  • 9 PM–12 AM53%(32 flights)
On-time trend by month
97%
May

Jun 72% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%32
July 202568%40
August 2025100%30
September 2025100%30
October 202565%26
November 202567%24
December 202580%20
January 2026100%26
February 2026100%35
March 202661%31
April 202686%29
May 202697%30
Departures on time
81%
Diverted
0%
Flights flown
353
Months covered
12

Keep nerding

Based on 358 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.