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Flight Reliability

WN 277 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 277 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

88%
Arrive within 15 minutes
2 min early
Average arrival delay
0.9%
Cancelled
9 min early
Median arrival delay

Based on 431 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon92%(60 flights)
  • Tue88%(51 flights)
  • Wed90%(52 flights)
  • Thu85%(60 flights)
  • Fri84%(69 flights)
  • Sat94%(51 flights)
  • Sun83%(83 flights)
On-time by departure window
  • 3–6 AM—(7 flights)
  • 6–9 AM95%(189 flights)
  • 9 AM–12 PM92%(114 flights)
  • 12–3 PM69%(71 flights)
  • 3–6 PM74%(27 flights)
  • 6–9 PM—(9 flights)
  • 9 PM–12 AM—(9 flights)
On-time trend by month
91%
May

Jun 83% → May 91% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202577%31
August 202592%36
September 202592%38
October 202583%18
November 202598%54
December 202592%38
January 202697%32
February 202688%33
March 202655%31
April 202688%40
May 202691%45
Departures on time
87%
Diverted
0.2%
Flights flown
426
Months covered
12

Keep nerding

Based on 431 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.