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Flight Reliability

WN 4003 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4003 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
0 min
Average arrival delay
0.3%
Cancelled
7 min early
Median arrival delay

Based on 306 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon85%(46 flights)
  • Tue87%(46 flights)
  • Wed93%(43 flights)
  • Thu84%(43 flights)
  • Fri88%(42 flights)
  • Sat91%(43 flights)
  • Sun91%(42 flights)
On-time by departure window
  • 3–6 AM90%(39 flights)
  • 6–9 AM93%(139 flights)
  • 9 AM–12 PM91%(44 flights)
  • 12–3 PM78%(58 flights)
  • 3–6 PM80%(20 flights)
  • 6–9 PM—(5 flights)
On-time trend by month
87%
May

Jun 80% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%30
July 202593%30
August 2025100%30
September 202593%30
October 202588%59
December 202582%11
February 202692%12
March 202667%27
April 202693%30
May 202687%31
Departures on time
87%
Diverted
0%
Flights flown
305
Months covered
12

Keep nerding

Based on 306 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.