Skip to content
WanderNerd
Check a flight

Flight Reliability

WN 257 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 257 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

71%
Arrive within 15 minutes
12 min
Average arrival delay
1.7%
Cancelled
0 min
Median arrival delay

Based on 478 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon69%(72 flights)
  • Tue80%(64 flights)
  • Wed73%(67 flights)
  • Thu71%(70 flights)
  • Fri67%(67 flights)
  • Sat68%(50 flights)
  • Sun66%(79 flights)
On-time by departure window
  • 6–9 AM90%(98 flights)
  • 9 AM–12 PM81%(113 flights)
  • 12–3 PM74%(73 flights)
  • 3–6 PM55%(92 flights)
  • 6–9 PM51%(93 flights)
On-time trend by month
54%
May

Jun 70% → May 54% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%40
July 202561%44
August 202582%49
September 202596%51
October 202585%27
November 202582%49
December 202583%48
January 202679%14
February 202648%31
March 202644%57
April 202658%33
May 202654%26
Departures on time
67%
Diverted
0.2%
Flights flown
469
Months covered
12

Keep nerding

Based on 478 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.