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Flight Reliability

WN 4311 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4311 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

90%
Arrive within 15 minutes
1 min early
Average arrival delay
0%
Cancelled
7 min early
Median arrival delay

Based on 189 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon82%(28 flights)
  • Tue100%(22 flights)
  • Wed100%(19 flights)
  • Thu81%(26 flights)
  • Fri75%(32 flights)
  • Sat96%(28 flights)
  • Sun100%(34 flights)
On-time by departure window
  • 6–9 AM93%(123 flights)
  • 9 AM–12 PM—(8 flights)
  • 12–3 PM86%(50 flights)
  • 3–6 PM—(8 flights)
On-time trend by month
100%
May

Aug 89% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 202589%27
September 202583%30
November 202595%19
December 202582%17
February 202680%25
April 202696%24
May 2026100%30
Departures on time
87%
Diverted
0%
Flights flown
189
Months covered
11

Keep nerding

Based on 189 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.