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Flight Reliability

WN 1121 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1121 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

84%
Arrive within 15 minutes
1 min
Average arrival delay
0%
Cancelled
4 min early
Median arrival delay

Based on 362 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon94%(49 flights)
  • Tue84%(55 flights)
  • Wed79%(53 flights)
  • Thu77%(47 flights)
  • Fri94%(50 flights)
  • Sat71%(44 flights)
  • Sun86%(64 flights)
On-time by departure window
  • 3–6 AM96%(28 flights)
  • 6–9 AM90%(57 flights)
  • 9 AM–12 PM88%(95 flights)
  • 12–3 PM75%(101 flights)
  • 3–6 PM77%(57 flights)
  • 6–9 PM—(6 flights)
  • 9 PM–12 AM94%(18 flights)
On-time trend by month
84%
May

Jun 90% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%29
July 202581%31
August 202597%31
September 202590%30
October 202590%31
November 202590%29
December 202584%38
January 202682%33
February 202668%28
March 202661%23
April 202682%28
May 202684%31
Departures on time
82%
Diverted
0%
Flights flown
362
Months covered
12

Keep nerding

Based on 362 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.