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Flight Reliability

WN 634 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 634 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

85%
Arrive within 15 minutes
0 min
Average arrival delay
0.5%
Cancelled
7 min early
Median arrival delay

Based on 424 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon83%(59 flights)
  • Tue93%(54 flights)
  • Wed96%(56 flights)
  • Thu80%(60 flights)
  • Fri79%(57 flights)
  • Sat91%(64 flights)
  • Sun76%(72 flights)
On-time by departure window
  • 6–9 AM93%(142 flights)
  • 9 AM–12 PM90%(76 flights)
  • 12–3 PM77%(84 flights)
  • 3–6 PM77%(39 flights)
  • 6–9 PM79%(81 flights)
On-time trend by month
94%
May

Jun 97% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%30
July 202597%30
August 202584%38
September 202590%38
October 202574%43
November 202584%50
December 202582%49
January 202670%33
February 202667%27
March 202692%24
April 2026100%29
May 202694%31
Departures on time
78%
Diverted
0%
Flights flown
422
Months covered
12

Keep nerding

Based on 424 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.