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Flight Reliability

WN 1138 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1138 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

77%
Arrive within 15 minutes
11 min
Average arrival delay
0.8%
Cancelled
4 min early
Median arrival delay

Based on 504 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon78%(73 flights)
  • Tue89%(71 flights)
  • Wed85%(67 flights)
  • Thu75%(73 flights)
  • Fri67%(76 flights)
  • Sat78%(78 flights)
  • Sun69%(61 flights)
On-time by departure window
  • 6–9 AM100%(23 flights)
  • 9 AM–12 PM88%(106 flights)
  • 12–3 PM77%(207 flights)
  • 3–6 PM66%(116 flights)
  • 6–9 PM75%(24 flights)
  • 9 PM–12 AM65%(23 flights)
On-time trend by month
55%
May

Jun 68% → May 55% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%41
July 202574%42
August 202574%57
September 202568%60
October 202590%51
November 202576%33
December 202575%40
January 202691%33
February 202685%27
March 202686%50
April 202688%34
May 202655%31
Departures on time
72%
Diverted
0.2%
Flights flown
499
Months covered
12

Keep nerding

Based on 504 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.