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Flight Reliability

WN 1139 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1139 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

81%
Arrive within 15 minutes
3 min
Average arrival delay
1.5%
Cancelled
8 min early
Median arrival delay

Based on 400 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon84%(50 flights)
  • Tue83%(65 flights)
  • Wed81%(68 flights)
  • Thu88%(48 flights)
  • Fri76%(45 flights)
  • Sat73%(48 flights)
  • Sun82%(68 flights)
On-time by departure window
  • 3–6 AM95%(43 flights)
  • 6–9 AM98%(50 flights)
  • 9 AM–12 PM80%(54 flights)
  • 12–3 PM80%(115 flights)
  • 3–6 PM69%(107 flights)
  • 6–9 PM83%(23 flights)
On-time trend by month
68%
May

Jun 59% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202559%34
July 202575%36
August 2025100%31
September 202597%30
October 202589%28
November 202584%49
December 202581%57
February 202670%23
March 202689%35
April 202684%31
May 202668%31
Departures on time
78%
Diverted
0.5%
Flights flown
392
Months covered
12

Keep nerding

Based on 400 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.