Skip to content
WanderNerd
Check a flight

Flight Reliability

WN 1218 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1218 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
4 min
Average arrival delay
0.4%
Cancelled
5 min early
Median arrival delay

Based on 501 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(67 flights)
  • Tue85%(86 flights)
  • Wed87%(94 flights)
  • Thu80%(71 flights)
  • Fri74%(57 flights)
  • Sat83%(60 flights)
  • Sun77%(64 flights)
On-time by departure window
  • 3–6 AM95%(21 flights)
  • 6–9 AM85%(91 flights)
  • 9 AM–12 PM88%(132 flights)
  • 12–3 PM86%(70 flights)
  • 3–6 PM77%(93 flights)
  • 6–9 PM67%(86 flights)
  • 9 PM–12 AM—(6 flights)
On-time trend by month
75%
May

Jun 83% → May 75% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%40
July 202580%45
August 2025100%28
September 2025100%26
October 202594%34
November 202591%66
December 202565%60
January 202667%33
February 202668%28
March 202683%57
April 202681%42
May 202675%40
Departures on time
75%
Diverted
0%
Flights flown
499
Months covered
12

Keep nerding

Based on 501 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.