SJU to IAH flight delays & on-time performance
Nonstop flights from Luis Munoz Marin International Airport to George Bush Intercontinental Airport · 2,007 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SJU 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 Juan (SJU) to Houston (IAH) arrived on time 88% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.5% were cancelled, and 4% arrived an hour or more late.
- United Airlines was the most punctual airline here (89% on time); Spirit Airlines was the least (68%).
- Departures scheduled around 7am did best (96% on time); around 3pm did worst (77%).
- Tuesday was the most reliable day to fly (91% on time) and Sunday the least (82%).
- The largest source of delay minutes was late-arriving aircraft (53%).
Which airline is most on time from SJU 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 |
|---|---|---|---|---|---|
| United Airlines | 89% | 0.5% | 7 min | 2.8% | 872 |
| Spirit Airlines | 68% | 1.7% | 24 min | 15.8% | 58 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 2am93%90 flights
- 6am91%46 flights
- 7am96%336 flights
- 9am90%10 flights
- 10am95%43 flights
- 2pm82%239 flights
- 3pm77%135 flights
- 4pm54%13 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday89%0.8% cancelled
- Tuesday91%0.0% cancelled
- Wednesday91%0.0% cancelled
- Thursday86%0.0% cancelled
- Friday90%0.0% cancelled
- Saturday88%2.8% cancelled
- Sunday82%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 aircraft53%
- Airline (crew, maintenance, cleaning, fueling)25%
- Air traffic control & airport congestion22%
- Extreme weather0%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Air traffic control & airport congestion80%
- Airline (crew, maintenance, cleaning, fueling)20%
- Extreme weather0%
- Security0%
SJU to IAH: common questions
- How often are SJU to IAH flights on time?
- 88% 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 Juan to Houston cancelled?
- 0.5% of scheduled flights were cancelled (5 of 930).
- 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 58 min behind schedule on average, and 3.6% of flights were an hour or more late.
- How long is taxi time at SJU?
- Flights on this route spent 16 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAH to SJU — 83% on time
More flights from San Juan
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SJU → IAH, nonstop flights by US airlines that report to the DOT. How we calculate this.