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Flight Reliability

WN 4518 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4518 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

80%
Arrive within 15 minutes
6 min
Average arrival delay
1.0%
Cancelled
1 min early
Median arrival delay

Based on 303 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon86%(44 flights)
  • Tue88%(43 flights)
  • Wed81%(43 flights)
  • Thu63%(43 flights)
  • Fri84%(43 flights)
  • Sat75%(40 flights)
  • Sun84%(44 flights)
On-time by departure window
  • 6–9 AM94%(70 flights)
  • 9 AM–12 PM84%(94 flights)
  • 12–3 PM82%(22 flights)
  • 3–6 PM77%(31 flights)
  • 6–9 PM70%(70 flights)
  • 9 PM–12 AM39%(13 flights)
On-time trend by month
82%
May

Jun 75% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202575%24
July 202576%21
October 202566%29
November 202568%28
December 202574%31
January 202680%30
February 202681%26
March 2026100%30
April 202692%38
May 202682%39
Departures on time
76%
Diverted
0%
Flights flown
300
Months covered
11

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.