IAH to SJU flight delays & on-time performance
Nonstop flights from George Bush Intercontinental Airport to Luis Munoz Marin International Airport · 2,007 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAH or SJU right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Houston (IAH) to San Juan (SJU) arrived on time 83% 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 (84% on time); Spirit Airlines was the least (57%).
- Departures scheduled around 3pm did best (90% on time); around 10am did worst (78%).
- Tuesday was the most reliable day to fly (91% on time) and Saturday the least (72%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (35%).
Which airline is most on time from IAH to SJU?
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 | 84% | 0.3% | 8 min | 2.9% | 872 |
| Spirit Airlines | 57% | 3.6% | 35 min | 18.5% | 56 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 9am64%22 flights
- 10am78%365 flights
- 11am50%10 flights
- 3pm90%364 flights
- 11pm85%143 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday86%0.0% cancelled
- Tuesday91%0.0% cancelled
- Wednesday84%0.0% cancelled
- Thursday85%0.0% cancelled
- Friday85%0.7% cancelled
- Saturday72%2.1% cancelled
- Sunday78%0.7% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)35%
- Air traffic control & airport congestion33%
- Late-arriving aircraft28%
- Extreme weather4%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Air traffic control & airport congestion60%
- Extreme weather40%
- Airline (crew, maintenance, cleaning, fueling)0%
- Security0%
IAH to SJU: common questions
- How often are IAH to SJU flights on time?
- 83% 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 Houston to San Juan cancelled?
- 0.5% of scheduled flights were cancelled (5 of 928).
- How long are typical delays?
- Across all flights the average arrival delay was 9 min (early arrivals count as zero). Flights that were late arrived 48 min behind schedule on average, and 3.8% of flights were an hour or more late.
- How long is taxi time at IAH?
- Flights on this route spent 23 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SJU to IAH — 88% on time
More flights from Houston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: IAH → SJU, nonstop flights by US airlines that report to the DOT. How we calculate this.