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Flight Reliability

WN 3151 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3151 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
10 min
Average arrival delay
1.2%
Cancelled
1 min early
Median arrival delay

Based on 322 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon69%(48 flights)
  • Tue77%(48 flights)
  • Wed86%(51 flights)
  • Thu71%(51 flights)
  • Fri67%(45 flights)
  • Sat77%(35 flights)
  • Sun83%(40 flights)
On-time by departure window
  • 3–6 AM98%(40 flights)
  • 6–9 AM90%(78 flights)
  • 12–3 PM—(2 flights)
  • 3–6 PM60%(72 flights)
  • 6–9 PM71%(94 flights)
  • 9 PM–12 AM59%(32 flights)
On-time trend by month
48%
May

Jun 89% → May 48% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202589%18
July 202554%13
August 202541%29
September 202563%30
October 202583%18
November 202583%35
December 202581%36
January 202697%30
February 202693%28
March 202683%30
April 202681%26
May 202648%25
Departures on time
72%
Diverted
0%
Flights flown
318
Months covered
12

Keep nerding

Based on 322 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.