Skip to content
WanderNerd
Check a flight

Flight Reliability

WN 3251 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3251 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
7 min
Average arrival delay
1.4%
Cancelled
1 min early
Median arrival delay

Based on 415 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon85%(53 flights)
  • Tue84%(55 flights)
  • Wed71%(58 flights)
  • Thu74%(57 flights)
  • Fri79%(58 flights)
  • Sat70%(46 flights)
  • Sun65%(80 flights)
On-time by departure window
  • 3–6 AM97%(39 flights)
  • 6–9 AM82%(17 flights)
  • 9 AM–12 PM87%(134 flights)
  • 12–3 PM51%(47 flights)
  • 3–6 PM57%(60 flights)
  • 6–9 PM72%(75 flights)
  • 9 PM–12 AM66%(35 flights)
On-time trend by month
87%
May

Jun 69% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%35
July 202580%39
August 202566%38
September 202571%38
October 202565%26
November 202574%50
December 202573%30
January 202690%29
February 202689%27
March 202652%33
April 202687%31
May 202687%31
Departures on time
75%
Diverted
0.5%
Flights flown
407
Months covered
12

Keep nerding

Based on 415 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.