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Flight Reliability

WN 1220 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1220 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

79%
Arrive within 15 minutes
3 min
Average arrival delay
1.0%
Cancelled
6 min early
Median arrival delay

Based on 481 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(64 flights)
  • Tue90%(68 flights)
  • Wed88%(69 flights)
  • Thu77%(66 flights)
  • Fri76%(63 flights)
  • Sat76%(70 flights)
  • Sun76%(76 flights)
On-time by departure window
  • 3–6 AM—(4 flights)
  • 6–9 AM92%(48 flights)
  • 9 AM–12 PM89%(113 flights)
  • 12–3 PM80%(189 flights)
  • 3–6 PM72%(46 flights)
  • 6–9 PM61%(76 flights)
On-time trend by month
58%
May

Jun 98% → May 58% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202598%45
July 202580%46
August 202568%31
September 202588%25
October 202575%44
November 202593%30
December 202577%31
January 202681%53
February 202690%52
March 202667%54
April 202675%32
May 202658%33
Departures on time
74%
Diverted
0%
Flights flown
476
Months covered
12

Keep nerding

Based on 481 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.