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Flight Reliability

WN 278 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 278 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

78%
Arrive within 15 minutes
7 min
Average arrival delay
0.5%
Cancelled
5 min early
Median arrival delay

Based on 372 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon73%(52 flights)
  • Tue85%(67 flights)
  • Wed78%(69 flights)
  • Thu74%(50 flights)
  • Fri72%(47 flights)
  • Sat89%(26 flights)
  • Sun75%(56 flights)
On-time by departure window
  • 3–6 AM95%(40 flights)
  • 6–9 AM83%(12 flights)
  • 9 AM–12 PM85%(87 flights)
  • 12–3 PM63%(87 flights)
  • 3–6 PM79%(111 flights)
  • 6–9 PM66%(29 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
58%
May

Jun 71% → May 58% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%17
July 202533%18
August 202565%37
September 202556%39
November 202594%48
December 202597%67
January 202690%31
February 202678%27
March 202692%26
April 202668%25
May 202658%26
Departures on time
72%
Diverted
0.8%
Flights flown
367
Months covered
12

Keep nerding

Based on 372 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.