Skip to content
WanderNerd
Check a flight

Flight Reliability

WN 237 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 237 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
9 min
Average arrival delay
1.2%
Cancelled
1 min early
Median arrival delay

Based on 425 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(65 flights)
  • Tue88%(51 flights)
  • Wed83%(52 flights)
  • Thu74%(66 flights)
  • Fri69%(64 flights)
  • Sat77%(60 flights)
  • Sun57%(60 flights)
On-time by departure window
  • 6–9 AM95%(40 flights)
  • 9 AM–12 PM88%(32 flights)
  • 12–3 PM86%(98 flights)
  • 3–6 PM69%(122 flights)
  • 6–9 PM64%(121 flights)
  • 9 PM–12 AM—(5 flights)
On-time trend by month
70%
May

Jun 73% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%48
July 202581%47
August 202564%39
September 202567%33
October 202571%31
November 202579%28
December 202565%31
January 202680%30
February 202693%27
March 202690%41
April 202667%33
May 202670%30
Departures on time
70%
Diverted
0.5%
Flights flown
418
Months covered
12

Keep nerding

Based on 425 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.