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Flight Reliability

WN 1551 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1551 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
9 min
Average arrival delay
1.3%
Cancelled
3 min early
Median arrival delay

Based on 473 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon78%(64 flights)
  • Tue70%(80 flights)
  • Wed77%(78 flights)
  • Thu82%(67 flights)
  • Fri69%(64 flights)
  • Sat86%(49 flights)
  • Sun68%(65 flights)
On-time by departure window
  • 3–6 AM86%(22 flights)
  • 6–9 AM86%(131 flights)
  • 9 AM–12 PM81%(118 flights)
  • 12–3 PM78%(67 flights)
  • 3–6 PM43%(49 flights)
  • 6–9 PM64%(80 flights)
On-time trend by month
49%
May

Jun 78% → May 49% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202578%51
July 202574%61
August 202579%34
September 202574%34
October 202597%30
November 202577%48
December 202577%44
January 202684%31
February 202671%28
March 202680%30
April 202668%37
May 202649%39
Departures on time
73%
Diverted
0%
Flights flown
467
Months covered
12

Keep nerding

Based on 473 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.