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Flight Reliability

WN 1636 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1636 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
0.8%
Cancelled
8 min early
Median arrival delay

Based on 478 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon82%(94 flights)
  • Tue92%(51 flights)
  • Wed90%(51 flights)
  • Thu84%(94 flights)
  • Fri91%(88 flights)
  • Sat89%(37 flights)
  • Sun93%(57 flights)
On-time by departure window
  • 3–6 AM92%(38 flights)
  • 6–9 AM91%(350 flights)
  • 9 AM–12 PM75%(59 flights)
  • 12–3 PM72%(25 flights)
On-time trend by month
91%
May

Jun 76% → May 91% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%72
July 202588%67
August 202579%34
September 202596%26
October 202580%35
November 202597%36
December 202598%41
February 2026100%25
March 202684%57
April 202692%37
May 202691%34
Departures on time
89%
Diverted
0.4%
Flights flown
472
Months covered
12

Keep nerding

Based on 478 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.