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Flight Reliability

WN 1378 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1378 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

76%
Arrive within 15 minutes
12 min
Average arrival delay
0.6%
Cancelled
1 min
Median arrival delay

Based on 361 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon78%(55 flights)
  • Tue69%(45 flights)
  • Wed77%(44 flights)
  • Thu80%(55 flights)
  • Fri80%(59 flights)
  • Sat71%(49 flights)
  • Sun73%(51 flights)
On-time by departure window
  • 6–9 AM85%(86 flights)
  • 9 AM–12 PM88%(67 flights)
  • 12–3 PM83%(54 flights)
  • 3–6 PM73%(45 flights)
  • 6–9 PM54%(82 flights)
  • 9 PM–12 AM71%(24 flights)
On-time trend by month
94%
May

Jun 57% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202557%30
July 202542%31
August 202585%40
September 202579%43
October 202570%30
November 202595%20
December 202582%17
January 202673%30
February 202680%25
March 202677%31
April 202680%30
May 202694%31
Departures on time
71%
Diverted
0.3%
Flights flown
358
Months covered
12

Keep nerding

Based on 361 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.