SAT to STL flight delays & on-time performance
Nonstop flights from San Antonio International Airport to St. Louis Lambert International Airport · 786 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SAT or STL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from San Antonio (SAT) to St. Louis (STL) arrived on time 86% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0% were cancelled, and 4% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 5am did best (98% on time); around 4pm did worst (70%).
- Tuesday was the most reliable day to fly (94% on time) and Sunday the least (73%).
- The largest source of delay minutes was late-arriving aircraft (58%).
Which airline is most on time from SAT to STL?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Southwest Airlines | 86% | 0.0% | 8 min | 3.7% | 548 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am98%62 flights
- 7am94%148 flights
- 10am97%31 flights
- 12pm92%25 flights
- 2pm76%17 flights
- 3pm87%84 flights
- 4pm70%103 flights
- 5pm71%45 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday85%0.0% cancelled
- Tuesday94%0.0% cancelled
- Wednesday92%0.0% cancelled
- Thursday84%0.0% cancelled
- Friday84%0.0% cancelled
- Saturday89%0.0% cancelled
- Sunday73%0.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft58%
- Airline (crew, maintenance, cleaning, fueling)30%
- Air traffic control & airport congestion9%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
No cancellation causes recorded in this period.
SAT to STL: common questions
- How often are SAT to STL flights on time?
- 86% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from San Antonio to St. Louis cancelled?
- 0.0% of scheduled flights were cancelled (0 of 548).
- How long are typical delays?
- Across all flights the average arrival delay was 8 min (early arrivals count as zero). Flights that were late arrived 51 min behind schedule on average, and 3.7% of flights were an hour or more late.
- How long is taxi time at SAT?
- Flights on this route spent 11 min taxiing from the gate to takeoff on average.
Related routes
Return trip: STL to SAT — 81% on time
More flights from San Antonio
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SAT → STL, nonstop flights by US airlines that report to the DOT. How we calculate this.