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Flight Reliability

WN 4280 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4280 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

81%
Arrive within 15 minutes
5 min
Average arrival delay
0.7%
Cancelled
4 min early
Median arrival delay

Based on 303 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon78%(45 flights)
  • Tue81%(42 flights)
  • Wed86%(36 flights)
  • Thu85%(39 flights)
  • Fri81%(48 flights)
  • Sat83%(41 flights)
  • Sun78%(50 flights)
On-time by departure window
  • 6–9 AM85%(13 flights)
  • 9 AM–12 PM92%(52 flights)
  • 12–3 PM85%(112 flights)
  • 3–6 PM77%(104 flights)
  • 6–9 PM53%(19 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
71%
May

Jun 92% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202592%50
July 202589%55
August 202595%21
September 202588%17
October 202584%38
November 202575%28
December 202560%37
March 202664%11
April 202684%19
May 202671%14
Departures on time
78%
Diverted
0%
Flights flown
301
Months covered
12

Keep nerding

Based on 303 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.