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Route Reliability

St. Louis → San Antonio

STL–SAT · 786 miles · St. Louis Lambert International Airport to San Antonio International Airport

88
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
0 min
Average arrival delay
0.2%
Cancelled
547
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 83% of the time across 547 flights. No comparison to make.

What the data says

Morning flights do better here.

STL–SAT flights departing between 6–9 AM arrived on time 95% of the time, versus 68% between 9 PM–12 AM.

Sunday scaries are real for this one.

STL–SAT flights arrived on time 89% of the time on Tuesdays. On Sundays: 75%.

It basically never cancels.

Out of 547 scheduled flights, only 0.2% were cancelled.

Slipping a little lately.

STL–SAT flights arrived on time 84% of the time over the last three months in the data, compared with 87% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon84%(89 flights)
  • Tue89%(80 flights)
  • Wed87%(77 flights)
  • Thu84%(87 flights)
  • Fri82%(87 flights)
  • Sat83%(46 flights)
  • Sun75%(76 flights)
On-time by departure window
  • 6–9 AM95%(97 flights)
  • 9 AM–12 PM90%(198 flights)
  • 12–3 PM82%(27 flights)
  • 3–6 PM74%(42 flights)
  • 6–9 PM76%(97 flights)
  • 9 PM–12 AM68%(81 flights)
On-time trend by month
84%
May

Jun 73% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%52
July 202583%53
August 202576%46
September 202589%47
October 202587%52
November 202591%33
December 202575%40
January 202693%28
February 202692%26
March 202682%54
April 202686%56
May 202684%55

Keep nerding

Based on 547 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.