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Flight Reliability

WN 635 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 635 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
10 min
Average arrival delay
0.3%
Cancelled
3 min early
Median arrival delay

Based on 398 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(68 flights)
  • Tue81%(47 flights)
  • Wed83%(46 flights)
  • Thu66%(68 flights)
  • Fri68%(68 flights)
  • Sat97%(39 flights)
  • Sun75%(60 flights)
On-time by departure window
  • 3–6 AM97%(60 flights)
  • 6–9 AM95%(38 flights)
  • 9 AM–12 PM—(6 flights)
  • 12–3 PM87%(53 flights)
  • 3–6 PM63%(104 flights)
  • 6–9 PM65%(135 flights)
On-time trend by month
97%
May

Jun 48% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202548%46
July 202549%47
August 202580%25
September 202595%21
October 202569%42
November 202561%43
December 202591%35
January 202694%31
February 202680%25
March 202696%23
April 202696%27
May 202697%31
Departures on time
70%
Diverted
0.3%
Flights flown
396
Months covered
12

Keep nerding

Based on 398 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.