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Flight Reliability

WN 4172 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4172 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

77%
Arrive within 15 minutes
6 min
Average arrival delay
1.7%
Cancelled
2 min early
Median arrival delay

Based on 302 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon59%(41 flights)
  • Tue85%(46 flights)
  • Wed88%(43 flights)
  • Thu70%(33 flights)
  • Fri76%(49 flights)
  • Sat95%(40 flights)
  • Sun63%(43 flights)
On-time by departure window
  • 6–9 AM83%(18 flights)
  • 9 AM–12 PM91%(77 flights)
  • 12–3 PM81%(78 flights)
  • 3–6 PM70%(59 flights)
  • 6–9 PM57%(56 flights)
  • 9 PM–12 AM—(7 flights)
On-time trend by month
69%
May

Aug 85% → May 69% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 202585%26
September 2025100%30
November 202590%20
December 202541%39
January 202688%50
February 202682%39
March 202686%28
April 202659%29
May 202669%32
Departures on time
72%
Diverted
0.7%
Flights flown
295
Months covered
11

Keep nerding

Based on 302 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.