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Flight Reliability

WN 311 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 311 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
6 min
Average arrival delay
0.3%
Cancelled
4 min early
Median arrival delay

Based on 762 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon73%(131 flights)
  • Tue88%(92 flights)
  • Wed81%(91 flights)
  • Thu74%(133 flights)
  • Fri75%(133 flights)
  • Sat85%(80 flights)
  • Sun87%(98 flights)
On-time by departure window
  • 3–6 AM—(8 flights)
  • 6–9 AM88%(115 flights)
  • 9 AM–12 PM86%(246 flights)
  • 12–3 PM77%(191 flights)
  • 3–6 PM67%(138 flights)
  • 6–9 PM68%(60 flights)
On-time trend by month
56%
May

Jun 75% → May 56% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202575%48
July 202583%54
August 202568%84
September 202587%90
October 202583%69
November 202579%68
December 202590%61
January 202687%69
February 202676%72
March 202688%49
April 202674%46
May 202656%48
Departures on time
79%
Diverted
0.3%
Flights flown
758
Months covered
12

Keep nerding

Based on 762 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.