SAT to IAH flight delays & on-time performance
Nonstop flights from San Antonio International Airport to George Bush Intercontinental Airport · 191 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SAT or IAH 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 Houston (IAH) arrived on time 82% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.6% were cancelled, and 5% arrived an hour or more late.
- Departures scheduled around 5am did best (95% on time); around 4pm did worst (73%).
- Monday was the most reliable day to fly (86% on time) and Friday the least (79%).
- The largest source of delay minutes was air traffic control & airport congestion (49%).
Which airline is most on time from SAT to IAH?
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 |
|---|---|---|---|---|---|
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 86% | 1.0% | 11 min | 3.8% | 105 |
| United Airlines | 82% | 0.6% | 12 min | 5.3% | 2,300 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am95%255 flights
- 7am77%365 flights
- 9am83%350 flights
- 11am89%239 flights
- 2pm84%287 flights
- 4pm73%353 flights
- 5pm78%269 flights
- 6pm78%118 flights
- 7pm86%158 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday86%0.9% cancelled
- Tuesday86%0.9% cancelled
- Wednesday83%0.3% cancelled
- Thursday80%0.6% cancelled
- Friday79%0.0% cancelled
- Saturday81%0.6% cancelled
- Sunday79%0.9% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Air traffic control & airport congestion49%
- Late-arriving aircraft27%
- Airline (crew, maintenance, cleaning, fueling)22%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)43%
- Extreme weather43%
- Air traffic control & airport congestion14%
- Security0%
SAT to IAH: common questions
- How often are SAT to IAH flights on time?
- 82% 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 Houston cancelled?
- 0.6% of scheduled flights were cancelled (14 of 2,405).
- How long are typical delays?
- Across all flights the average arrival delay was 12 min (early arrivals count as zero). Flights that were late arrived 60 min behind schedule on average, and 5.2% of flights were an hour or more late.
- How long is taxi time at SAT?
- Flights on this route spent 18 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAH to SAT — 83% 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 → IAH, nonstop flights by US airlines that report to the DOT. How we calculate this.