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Flight Reliability

WN 51 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 51 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

71%
Arrive within 15 minutes
10 min
Average arrival delay
0.3%
Cancelled
1 min early
Median arrival delay

Based on 400 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon75%(75 flights)
  • Tue79%(57 flights)
  • Wed66%(62 flights)
  • Thu61%(85 flights)
  • Fri73%(79 flights)
  • Sat71%(17 flights)
  • Sun75%(24 flights)
On-time by departure window
  • 12–3 PM92%(13 flights)
  • 3–6 PM79%(85 flights)
  • 6–9 PM67%(293 flights)
  • 9 PM–12 AM—(8 flights)
On-time trend by month
57%
May

Jun 54% → May 57% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202554%24
July 202579%24
August 202578%23
September 202568%22
October 202591%69
November 202566%56
December 202567%42
January 202686%22
February 202662%26
March 202656%45
April 202668%25
May 202657%21
Departures on time
67%
Diverted
0%
Flights flown
399
Months covered
12

Keep nerding

Based on 400 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.