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Flight Reliability

WN 139 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 139 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 early
Average arrival delay
0.4%
Cancelled
7 min early
Median arrival delay

Based on 564 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon85%(97 flights)
  • Tue96%(74 flights)
  • Wed91%(70 flights)
  • Thu88%(95 flights)
  • Fri84%(99 flights)
  • Sat85%(60 flights)
  • Sun85%(66 flights)
On-time by departure window
  • 3–6 AM87%(60 flights)
  • 6–9 AM98%(169 flights)
  • 9 AM–12 PM86%(172 flights)
  • 12–3 PM83%(107 flights)
  • 3–6 PM67%(51 flights)
  • 6–9 PM—(2 flights)
On-time trend by month
90%
May

Jun 85% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202585%72
July 202584%76
August 202589%37
September 202593%30
October 202571%31
November 202587%46
December 202587%52
January 2026100%36
February 2026100%28
March 202681%42
April 202691%54
May 202690%57
Departures on time
85%
Diverted
0.2%
Flights flown
561
Months covered
12

Keep nerding

Based on 564 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.