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Flight Reliability

WN 1991 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1991 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

73%
Arrive within 15 minutes
10 min
Average arrival delay
0.6%
Cancelled
2 min
Median arrival delay

Based on 494 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon77%(65 flights)
  • Tue65%(71 flights)
  • Wed61%(70 flights)
  • Thu74%(62 flights)
  • Fri70%(66 flights)
  • Sat89%(87 flights)
  • Sun71%(70 flights)
On-time by departure window
  • 3–6 AM92%(13 flights)
  • 6–9 AM79%(94 flights)
  • 9 AM–12 PM83%(112 flights)
  • 12–3 PM68%(68 flights)
  • 3–6 PM60%(30 flights)
  • 6–9 PM66%(174 flights)
On-time trend by month
69%
May

Jun 81% → May 69% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202581%43
July 202571%49
August 202585%39
September 202592%38
October 202587%31
November 202558%36
December 202546%44
January 202677%51
February 202657%37
March 202681%32
April 202677%43
May 202669%48
Departures on time
70%
Diverted
0%
Flights flown
491
Months covered
12

Keep nerding

Based on 494 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.