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Flight Reliability

WN 437 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 437 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

76%
Arrive within 15 minutes
5 min
Average arrival delay
0.5%
Cancelled
2 min early
Median arrival delay

Based on 380 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon69%(64 flights)
  • Tue78%(50 flights)
  • Wed82%(51 flights)
  • Thu75%(60 flights)
  • Fri72%(57 flights)
  • Sat83%(46 flights)
  • Sun74%(50 flights)
On-time by departure window
  • 3–6 AM—(2 flights)
  • 6–9 AM95%(75 flights)
  • 9 AM–12 PM79%(142 flights)
  • 12–3 PM69%(42 flights)
  • 3–6 PM62%(65 flights)
  • 6–9 PM62%(47 flights)
  • 9 PM–12 AM—(5 flights)
On-time trend by month
62%
May

Jun 81% → May 62% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202581%47
July 202584%45
August 202588%34
September 202577%30
October 202590%31
November 202561%38
December 202560%45
January 202664%11
February 202695%21
March 202688%24
April 202658%26
May 202662%26
Departures on time
68%
Diverted
0%
Flights flown
378
Months covered
12

Keep nerding

Based on 380 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.