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Flight Reliability

WN 1837 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 1837 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
8 min
Average arrival delay
0.8%
Cancelled
2 min early
Median arrival delay

Based on 359 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon77%(52 flights)
  • Tue88%(43 flights)
  • Wed91%(43 flights)
  • Thu75%(55 flights)
  • Fri77%(56 flights)
  • Sat84%(49 flights)
  • Sun68%(57 flights)
On-time by departure window
  • 3–6 AM100%(24 flights)
  • 6–9 AM95%(60 flights)
  • 9 AM–12 PM98%(49 flights)
  • 12–3 PM78%(36 flights)
  • 3–6 PM65%(78 flights)
  • 6–9 PM68%(108 flights)
On-time trend by month
58%
May

Jun 77% → May 58% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202577%30
July 202580%30
August 202544%23
September 202552%21
October 202593%30
November 202593%29
December 202584%31
January 202697%34
February 202693%43
March 202674%31
April 202678%27
May 202658%26
Departures on time
73%
Diverted
0.3%
Flights flown
355
Months covered
12

Keep nerding

Based on 359 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.