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Flight Reliability

WN 378 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 378 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

72%
Arrive within 15 minutes
11 min
Average arrival delay
1.2%
Cancelled
2 min early
Median arrival delay

Based on 324 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(47 flights)
  • Tue77%(43 flights)
  • Wed81%(43 flights)
  • Thu66%(47 flights)
  • Fri71%(48 flights)
  • Sat76%(42 flights)
  • Sun60%(50 flights)
On-time by departure window
  • 3–6 AM—(8 flights)
  • 6–9 AM100%(73 flights)
  • 9 AM–12 PM74%(54 flights)
  • 12–3 PM70%(10 flights)
  • 3–6 PM61%(43 flights)
  • 6–9 PM57%(129 flights)
  • 9 PM–12 AM—(3 flights)
On-time trend by month
23%
May

Jun 62% → May 23% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202562%29
July 202573%30
August 202563%24
September 202586%21
October 202594%17
November 202579%28
December 202566%29
January 202676%25
February 202696%26
March 2026100%31
April 202657%30
May 202623%30
Departures on time
67%
Diverted
0%
Flights flown
320
Months covered
12

Keep nerding

Based on 324 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.