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Flight Reliability

WN 2551 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 2551 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

78%
Arrive within 15 minutes
6 min
Average arrival delay
0.6%
Cancelled
4 min early
Median arrival delay

Based on 316 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon74%(39 flights)
  • Tue75%(52 flights)
  • Wed65%(51 flights)
  • Thu92%(39 flights)
  • Fri84%(37 flights)
  • Sat97%(30 flights)
  • Sun74%(65 flights)
On-time by departure window
  • 3–6 AM100%(26 flights)
  • 6–9 AM94%(35 flights)
  • 9 AM–12 PM86%(104 flights)
  • 12–3 PM65%(34 flights)
  • 3–6 PM60%(72 flights)
  • 6–9 PM76%(42 flights)
On-time trend by month
85%
May

Jun 71% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%34
July 202588%34
August 202575%16
September 202577%13
October 202560%35
November 202576%25
December 202566%29
January 202683%12
February 202675%12
March 202694%35
April 202685%34
May 202685%34
Departures on time
74%
Diverted
0.3%
Flights flown
313
Months covered
12

Keep nerding

Based on 316 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.