Skip to content
WanderNerd
Check a flight

Flight Reliability

WN 1871 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1871 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

77%
Arrive within 15 minutes
9 min
Average arrival delay
1.0%
Cancelled
2 min early
Median arrival delay

Based on 417 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(65 flights)
  • Tue78%(68 flights)
  • Wed72%(67 flights)
  • Thu78%(67 flights)
  • Fri79%(63 flights)
  • Sat73%(44 flights)
  • Sun76%(38 flights)
On-time by departure window
  • 3–6 AM97%(67 flights)
  • 6–9 AM93%(54 flights)
  • 9 AM–12 PM83%(29 flights)
  • 12–3 PM78%(97 flights)
  • 3–6 PM65%(133 flights)
  • 6–9 PM—(8 flights)
  • 9 PM–12 AM46%(24 flights)
On-time trend by month
54%
May

Jun 90% → May 54% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%29
July 202597%31
August 202592%25
September 202596%26
October 202586%55
November 202544%16
December 202540%25
January 202680%49
February 202690%38
March 202671%41
April 202665%40
May 202654%37
Departures on time
70%
Diverted
0.2%
Flights flown
412
Months covered
12

Keep nerding

Based on 417 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.