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Flight Reliability

WN 3503 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3503 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

75%
Arrive within 15 minutes
10 min
Average arrival delay
0.3%
Cancelled
5 min early
Median arrival delay

Based on 341 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon75%(55 flights)
  • Tue77%(44 flights)
  • Wed80%(46 flights)
  • Thu67%(57 flights)
  • Fri69%(58 flights)
  • Sat74%(38 flights)
  • Sun91%(42 flights)
On-time by departure window
  • 3–6 AM94%(54 flights)
  • 6–9 AM98%(61 flights)
  • 9 AM–12 PM95%(20 flights)
  • 12–3 PM77%(52 flights)
  • 3–6 PM18%(34 flights)
  • 6–9 PM67%(119 flights)
On-time trend by month
94%
May

Jun 36% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202536%22
July 202531%26
August 202590%30
September 2025100%30
October 202538%68
November 202589%18
December 202596%44
February 2026100%15
March 2026100%23
April 202697%29
May 202694%31
Departures on time
73%
Diverted
0%
Flights flown
340
Months covered
12

Keep nerding

Based on 341 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.