Skip to content
WanderNerd
Check a flight

Flight Reliability

WN 1257 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1257 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

74%
Arrive within 15 minutes
13 min
Average arrival delay
1.1%
Cancelled
1 min early
Median arrival delay

Based on 438 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(83 flights)
  • Tue77%(43 flights)
  • Wed76%(41 flights)
  • Thu69%(86 flights)
  • Fri71%(84 flights)
  • Sat90%(52 flights)
  • Sun69%(42 flights)
On-time by departure window
  • 3–6 AM91%(46 flights)
  • 6–9 AM91%(22 flights)
  • 9 AM–12 PM94%(63 flights)
  • 12–3 PM70%(126 flights)
  • 3–6 PM60%(127 flights)
  • 6–9 PM74%(46 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
91%
May

Jun 51% → May 91% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202551%49
July 202563%49
August 202575%28
September 2025100%22
October 202590%30
November 202575%32
December 202579%28
January 202681%31
February 202646%24
March 202677%31
April 202670%50
May 202691%57
Departures on time
72%
Diverted
0.5%
Flights flown
431
Months covered
12

Keep nerding

Based on 438 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.