BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
STL→SAT

St. Louis, MO (STL) to San Antonio, TX (SAT) flight delay odds

80.1% of 547 official scheduled STL-to-SAT flights arrived on time; 11.3% arrived at least 30 minutes late and 0.2% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALLower disruption
80.1%arrived on time
11.3%30+ min late
0.2%cancelled
547scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.1%all scheduled flights
120+ minutes late1.8%all scheduled flights
Diverted0.9%did not reach as scheduled
Average arrival+1.5 mincompleted flights

Which departure time was most reliable for STL to SAT?

Among qualifying STL-to-SAT departure window results, Late morning had the highest on-time rate: 89.8% of 177 flights. Night was lowest at 61.8% across 102 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning11989.1%6.7%0.0%
Late morning17789.8%2.8%0.0%
Afternoon4678.3%15.2%0.0%
Evening10371.8%15.5%1.0%
Night10261.8%25.5%0.0%

Which weekday was most reliable for STL to SAT?

Among qualifying STL-to-SAT weekday results, Tuesday had the highest on-time rate: 87.8% of 82 flights. Sunday was lowest at 72.0% across 75 flights.

DayFlightsOn time30+ minCancelled
Monday8976.4%15.7%0.0%
Tuesday8287.8%7.3%0.0%
Wednesday7885.9%6.4%0.0%
Thursday8780.5%10.3%0.0%
Friday8978.7%7.9%0.0%
Saturday4778.7%12.8%0.0%
Sunday7572.0%20.0%1.3%

Which airline was most reliable for STL to SAT?

Only Southwest Airlines met the STL-to-SAT airline threshold: 80.1% of 547 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines54780.1%11.3%0.2%

Which month was most reliable for STL to SAT?

Among qualifying STL-to-SAT month results, November 2025 had the highest on-time rate: 90.9% of 33 flights. June 2026 was lowest at 55.8% across 52 flights.

MonthFlightsOn time30+ minCancelled
July 20255381.1%17.0%0.0%
August 20254772.3%8.5%2.1%
September 20254787.2%4.3%0.0%
October 20255384.9%9.4%0.0%
November 20253390.9%3.0%0.0%
December 20254072.5%20.0%0.0%
January 20262989.7%3.4%0.0%
February 20262788.9%0.0%0.0%
March 20265481.5%7.4%0.0%
April 20265685.7%10.7%0.0%
May 20265680.4%10.7%0.0%
June 20265255.8%30.8%0.0%

What drove STL to SAT delay minutes?

Late aircraft was the largest recorded STL-to-SAT delay category, accounting for 59.8% of 5,487 BTS-attributed delay minutes during July 2025–June 2026.

Airline29.9%
Late aircraft59.8%
National airspace9.2%
Weather0.7%
Security0.3%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.