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Flight Reliability

WN 1577 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1577 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

84%
Arrive within 15 minutes
5 min
Average arrival delay
0.6%
Cancelled
4 min early
Median arrival delay

Based on 353 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon76%(54 flights)
  • Tue81%(41 flights)
  • Wed93%(41 flights)
  • Thu93%(53 flights)
  • Fri91%(57 flights)
  • Sat79%(42 flights)
  • Sun79%(63 flights)
On-time by departure window
  • 3–6 AM100%(16 flights)
  • 6–9 AM88%(109 flights)
  • 9 AM–12 PM89%(65 flights)
  • 12–3 PM79%(58 flights)
  • 3–6 PM76%(79 flights)
  • 6–9 PM—(9 flights)
  • 9 PM–12 AM87%(15 flights)
On-time trend by month
81%
May

Jun 81% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202581%31
July 202590%30
August 202587%30
September 202580%30
October 202589%27
November 202584%51
December 202593%28
January 202693%15
February 202695%19
March 202666%29
April 202683%30
May 202681%31
Departures on time
82%
Diverted
0%
Flights flown
351
Months covered
12

Keep nerding

Based on 353 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.