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Flight Reliability

WN 840 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 840 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

73%
Arrive within 15 minutes
10 min
Average arrival delay
0.2%
Cancelled
0 min
Median arrival delay

Based on 401 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon64%(58 flights)
  • Tue82%(67 flights)
  • Wed71%(65 flights)
  • Thu75%(55 flights)
  • Fri80%(59 flights)
  • Sat83%(36 flights)
  • Sun62%(60 flights)
On-time by departure window
  • 6–9 AM94%(71 flights)
  • 9 AM–12 PM89%(54 flights)
  • 12–3 PM61%(116 flights)
  • 3–6 PM68%(41 flights)
  • 6–9 PM67%(118 flights)
On-time trend by month
45%
May

Jun 64% → May 45% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%36
July 202563%40
August 202589%27
September 202596%26
October 202590%31
November 202583%48
December 202563%46
January 202683%30
February 202679%29
March 202674%27
April 202659%29
May 202645%31
Departures on time
68%
Diverted
0%
Flights flown
400
Months covered
12

Keep nerding

Based on 401 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.