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Route Reliability

San Antonio → St. Louis

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

95
Nerd Approved
WanderNerd Reliability Score
87%
Arrive within 15 minutes
0 min
Average arrival delay
0%
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 87% of the time across 547 flights. No comparison to make.

What the data says

Morning flights do better here.

SAT–STL flights departing between 3–6 AM arrived on time 99% of the time, versus 78% between 3–6 PM.

Sunday scaries are real for this one.

SAT–STL flights arrived on time 93% of the time on Tuesdays and just 77% on Sundays. That gap is worth planning around.

It basically never cancels.

Out of 547 scheduled flights, only 0.0% were cancelled.

Flights on this route

The breakdown

On-time by weekday
  • Mon89%(88 flights)
  • Tue93%(80 flights)
  • Wed92%(78 flights)
  • Thu85%(87 flights)
  • Fri88%(89 flights)
  • Sat89%(47 flights)
  • Sun77%(77 flights)
On-time by departure window
  • 3–6 AM99%(80 flights)
  • 6–9 AM95%(137 flights)
  • 9 AM–12 PM95%(40 flights)
  • 12–3 PM86%(59 flights)
  • 3–6 PM78%(229 flights)
  • 6–9 PM—(1 flights)
On-time trend by month
89%
May

Jun 85% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202585%52
July 202589%53
August 202592%47
September 202594%47
October 202591%53
November 202579%33
December 202585%40
January 202690%29
February 202689%27
March 202678%54
April 202689%56
May 202689%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.