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Flight Reliability

WN 3635 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 3635 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

86%
Arrive within 15 minutes
1 min early
Average arrival delay
1.3%
Cancelled
7 min early
Median arrival delay

Based on 374 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon90%(51 flights)
  • Tue86%(50 flights)
  • Wed90%(51 flights)
  • Thu90%(51 flights)
  • Fri89%(52 flights)
  • Sat79%(56 flights)
  • Sun81%(58 flights)
On-time by departure window
  • 6–9 AM95%(110 flights)
  • 9 AM–12 PM84%(109 flights)
  • 12–3 PM91%(63 flights)
  • 3–6 PM75%(55 flights)
  • 6–9 PM75%(32 flights)
On-time trend by month
94%
May

Jun 73% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%26
July 202583%24
October 202576%38
November 202590%30
December 202594%33
January 202688%57
February 202693%56
March 202680%39
April 202684%31
May 202694%31
Departures on time
83%
Diverted
0%
Flights flown
369
Months covered
11

Keep nerding

Based on 374 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.