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Flight Reliability

WN 1556 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1556 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

79%
Arrive within 15 minutes
7 min
Average arrival delay
0.2%
Cancelled
4 min early
Median arrival delay

Based on 444 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon88%(69 flights)
  • Tue72%(65 flights)
  • Wed77%(68 flights)
  • Thu83%(70 flights)
  • Fri87%(63 flights)
  • Sat79%(52 flights)
  • Sun63%(54 flights)
On-time by departure window
  • 3–6 AM—(3 flights)
  • 6–9 AM93%(104 flights)
  • 9 AM–12 PM96%(45 flights)
  • 12–3 PM77%(98 flights)
  • 3–6 PM65%(97 flights)
  • 6–9 PM71%(94 flights)
On-time trend by month
70%
May

Jun 78% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202578%59
July 202580%66
August 202587%37
September 202585%33
October 202596%26
November 202564%39
December 202569%45
January 202678%32
February 202696%28
March 202679%19
April 202674%27
May 202670%30
Departures on time
75%
Diverted
0.5%
Flights flown
441
Months covered
12

Keep nerding

Based on 444 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.