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Flight Reliability

WN 1040 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1040 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

79%
Arrive within 15 minutes
4 min
Average arrival delay
1.1%
Cancelled
4 min early
Median arrival delay

Based on 440 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(68 flights)
  • Tue92%(61 flights)
  • Wed88%(58 flights)
  • Thu66%(71 flights)
  • Fri82%(67 flights)
  • Sat83%(48 flights)
  • Sun71%(62 flights)
On-time by departure window
  • 3–6 AM97%(57 flights)
  • 6–9 AM92%(65 flights)
  • 9 AM–12 PM83%(117 flights)
  • 12–3 PM80%(65 flights)
  • 3–6 PM—(2 flights)
  • 6–9 PM60%(104 flights)
  • 9 PM–12 AM56%(25 flights)
On-time trend by month
42%
May

Jun 92% → May 42% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202592%50
July 202586%51
August 202594%32
September 202590%30
October 202584%56
November 202586%28
December 202575%28
January 202681%31
February 202663%27
March 202677%39
April 202656%32
May 202642%31
Departures on time
77%
Diverted
0%
Flights flown
435
Months covered
12

Keep nerding

Based on 440 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.