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Flight Reliability

WN 550 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 550 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

84%
Arrive within 15 minutes
3 min
Average arrival delay
0.9%
Cancelled
4 min early
Median arrival delay

Based on 337 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon91%(53 flights)
  • Tue77%(48 flights)
  • Wed80%(46 flights)
  • Thu96%(50 flights)
  • Fri86%(50 flights)
  • Sat80%(35 flights)
  • Sun77%(52 flights)
On-time by departure window
  • 3–6 AM97%(71 flights)
  • 6–9 AM94%(49 flights)
  • 9 AM–12 PM87%(31 flights)
  • 12–3 PM78%(18 flights)
  • 3–6 PM72%(64 flights)
  • 6–9 PM76%(75 flights)
  • 9 PM–12 AM85%(26 flights)
On-time trend by month
78%
May

Jun 89% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202589%18
July 202592%12
August 202592%26
September 202589%26
October 202597%31
November 202586%28
December 202569%26
January 202696%28
February 202686%28
March 202673%37
April 202676%37
May 202678%37
Departures on time
81%
Diverted
0%
Flights flown
334
Months covered
12

Keep nerding

Based on 337 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.