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Flight Reliability

WN 4034 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 4034 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

66%
Arrive within 15 minutes
16 min
Average arrival delay
1.1%
Cancelled
4 min
Median arrival delay

Based on 360 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon71%(58 flights)
  • Tue73%(41 flights)
  • Wed71%(42 flights)
  • Thu57%(61 flights)
  • Fri68%(59 flights)
  • Sat66%(29 flights)
  • Sun59%(64 flights)
On-time by departure window
  • 6–9 AM85%(68 flights)
  • 9 AM–12 PM89%(36 flights)
  • 12–3 PM68%(41 flights)
  • 3–6 PM61%(133 flights)
  • 6–9 PM43%(68 flights)
  • 9 PM–12 AM—(8 flights)
On-time trend by month
54%
May

Jun 35% → May 54% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202535%37
July 202549%33
August 202569%32
September 202583%30
October 202587%30
November 202556%25
December 202555%22
January 202674%27
February 202671%35
March 202683%30
April 202678%27
May 202654%26
Departures on time
59%
Diverted
0.6%
Flights flown
354
Months covered
12

Keep nerding

Based on 360 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.