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Airline Reliability

Southwest Airlines

Carrier code WN · 1,392,049 flights in the data

82
Pretty Reliable
WanderNerd Reliability Score
78%
Arrive within 15 minutes
7 min
Average arrival delay
0.9%
Cancelled
4 min early
Median arrival delay

Data through May 2026.

What the data says

Morning-you made the right choice.

Southwest Airlines flights departing between 3–6 AM arrived on time 95% of the time, versus 64% between 9 PM–12 AM.

Sunday scaries are real for this one.

Southwest Airlines flights arrived on time 82% of the time on Tuesdays. On Sundays: 74%.

Slipping a little lately.

Southwest Airlines flights arrived on time 76% of the time over the last three months in the data, compared with 81% in the three months before that.

The breakdown

On-time by weekday
  • Mon77%(206128 flights)
  • Tue82%(188403 flights)
  • Wed82%(186505 flights)
  • Thu75%(204514 flights)
  • Fri76%(206869 flights)
  • Sat81%(173632 flights)
  • Sun74%(210300 flights)
On-time by departure window
  • 3–6 AM95%(59552 flights)
  • 6–9 AM92%(278917 flights)
  • 9 AM–12 PM85%(243647 flights)
  • 12–3 PM76%(248128 flights)
  • 3–6 PM68%(244156 flights)
  • 6–9 PM65%(234704 flights)
  • 9 PM–12 AM64%(67247 flights)
On-time trend by month
73%
May

Jun 73% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%121152
July 202572%123527
August 202579%113679
September 202584%109889
October 202578%121092
November 202581%111817
December 202576%117213
January 202686%101120
February 202683%99578
March 202675%120102
April 202679%117330
May 202673%119852

Busiest Southwest Airlines routes

Biggest airports

Based on 1,392,049 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.