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Flight Reliability

WN 339 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 339 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

71%
Arrive within 15 minutes
17 min
Average arrival delay
2.1%
Cancelled
3 min
Median arrival delay

Based on 380 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon76%(45 flights)
  • Tue74%(70 flights)
  • Wed82%(67 flights)
  • Thu60%(47 flights)
  • Fri70%(47 flights)
  • Sat72%(43 flights)
  • Sun57%(51 flights)
On-time by departure window
  • 3–6 AM97%(38 flights)
  • 6–9 AM94%(69 flights)
  • 9 AM–12 PM81%(42 flights)
  • 12–3 PM59%(106 flights)
  • 3–6 PM55%(108 flights)
  • 6–9 PM—(6 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
55%
May

Jun 33% → May 55% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202533%24
July 202548%23
August 202591%46
September 202585%47
October 202590%19
November 202587%30
December 202568%31
January 202674%31
February 202682%28
March 202643%30
April 202670%30
May 202655%31
Departures on time
69%
Diverted
0.5%
Flights flown
370
Months covered
12

Keep nerding

Based on 380 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.