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Flight Reliability

WN 978 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 978 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

81%
Arrive within 15 minutes
10 min
Average arrival delay
0.3%
Cancelled
3 min early
Median arrival delay

Based on 357 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon92%(48 flights)
  • Tue78%(50 flights)
  • Wed80%(50 flights)
  • Thu87%(47 flights)
  • Fri80%(49 flights)
  • Sat81%(57 flights)
  • Sun74%(53 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM90%(135 flights)
  • 9 AM–12 PM92%(71 flights)
  • 12–3 PM71%(48 flights)
  • 3–6 PM49%(33 flights)
  • 6–9 PM77%(66 flights)
On-time trend by month
81%
May

Jun 68% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%28
July 202553%30
August 202587%31
September 2025100%30
October 202586%22
November 202587%31
December 202591%33
January 202674%31
February 202676%25
March 202684%31
April 202687%30
May 202681%32
Departures on time
79%
Diverted
0.6%
Flights flown
354
Months covered
12

Keep nerding

Based on 357 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.