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Flight Reliability

WN 503 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 503 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

76%
Arrive within 15 minutes
9 min
Average arrival delay
0.9%
Cancelled
4 min early
Median arrival delay

Based on 446 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(72 flights)
  • Tue82%(61 flights)
  • Wed75%(65 flights)
  • Thu69%(78 flights)
  • Fri72%(68 flights)
  • Sat71%(41 flights)
  • Sun84%(55 flights)
On-time by departure window
  • 3–6 AM95%(40 flights)
  • 6–9 AM96%(49 flights)
  • 9 AM–12 PM87%(45 flights)
  • 12–3 PM85%(53 flights)
  • 3–6 PM68%(162 flights)
  • 6–9 PM60%(91 flights)
On-time trend by month
97%
May

Jun 40% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202540%25
July 202535%26
August 202581%41
September 202579%43
October 202591%44
November 202580%49
December 202579%66
January 202688%16
February 202683%29
March 202661%38
April 202681%32
May 202697%31
Departures on time
73%
Diverted
0.4%
Flights flown
440
Months covered
12

Keep nerding

Based on 446 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.