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Flight Reliability

WN 557 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 557 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
10 min
Average arrival delay
0.8%
Cancelled
0 min
Median arrival delay

Based on 488 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon77%(68 flights)
  • Tue76%(67 flights)
  • Wed80%(69 flights)
  • Thu78%(67 flights)
  • Fri90%(67 flights)
  • Sat80%(44 flights)
  • Sun70%(98 flights)
On-time by departure window
  • 6–9 AM100%(13 flights)
  • 9 AM–12 PM88%(161 flights)
  • 12–3 PM74%(149 flights)
  • 3–6 PM65%(60 flights)
  • 6–9 PM74%(84 flights)
  • 9 PM–12 AM69%(13 flights)
On-time trend by month
75%
May

Jun 76% → May 75% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%63
July 202565%63
August 202589%35
September 202590%30
October 202572%46
November 202575%32
December 202580%30
January 202683%30
February 202692%25
March 202686%29
April 202676%46
May 202675%51
Departures on time
67%
Diverted
0.8%
Flights flown
480
Months covered
12

Keep nerding

Based on 488 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.