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Flight Reliability

WN 1503 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1503 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
8 min
Average arrival delay
0.8%
Cancelled
1 min early
Median arrival delay

Based on 259 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(29 flights)
  • Tue82%(44 flights)
  • Wed93%(44 flights)
  • Thu61%(28 flights)
  • Fri59%(29 flights)
  • Sat76%(42 flights)
  • Sun71%(41 flights)
On-time by departure window
  • 3–6 AM—(7 flights)
  • 6–9 AM—(3 flights)
  • 9 AM–12 PM77%(35 flights)
  • 12–3 PM80%(61 flights)
  • 3–6 PM75%(47 flights)
  • 6–9 PM80%(20 flights)
  • 9 PM–12 AM68%(84 flights)
On-time trend by month
71%
May

Jun 87% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%30
July 202570%30
August 202580%15
September 202592%13
October 202575%12
December 202573%11
January 202682%28
February 202672%18
March 202652%33
April 202684%31
May 202671%31
Departures on time
67%
Diverted
0%
Flights flown
257
Months covered
12

Keep nerding

Based on 259 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.