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Flight Reliability

WN 4375 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4375 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

85%
Arrive within 15 minutes
2 min early
Average arrival delay
0.8%
Cancelled
7 min early
Median arrival delay

Based on 130 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon84%(19 flights)
  • Tue95%(19 flights)
  • Wed89%(18 flights)
  • Thu76%(21 flights)
  • Fri75%(20 flights)
  • Sat88%(17 flights)
  • Sun93%(14 flights)
On-time by departure window
  • 6–9 AM—(8 flights)
  • 12–3 PM82%(67 flights)
  • 3–6 PM87%(46 flights)
  • 6–9 PM—(7 flights)
On-time trend by month
92%
May

Aug 100% → May 92% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 2025100%15
September 202577%17
October 202550%24
March 202691%11
April 2026100%23
May 202692%25
Departures on time
78%
Diverted
0.8%
Flights flown
128
Months covered
10

Keep nerding

Based on 130 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.