Route
IAH → SJU
George Bush Intercontinental Airport Luis Munoz Marin International Airport
2,007 miles
Return route SJU → IAH →
How punctual is this route?
- On-time arrivals
- 84.8%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 55 min
- Flights arriving 15+ minutes late
- Flights tracked
- 907
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 39%
- Air traffic control & airport 30%
- Late-arriving aircraft 28%
- Extreme weather 3%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 89.7% | 68 |
| October 2025 | 85.7% | 70 |
| November 2025 | 75.0% | 68 |
| December 2025 | 76.9% | 92 |
| January 2026 | 90.8% | 80 |
| February 2026 | 91.0% | 67 |
| March 2026 | 81.1% | 74 |
| April 2026 | 93.3% | 60 |
| May 2026 | 82.2% | 73 |
| June 2026 | 84.4% | 90 |
| July 2026 | 84.9% | 93 |
| August 2026 | 86.1% | 72 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| United Airlines | 864 | 85.9% | 0.3% | 49 min |
| NK | 43 | 61.0% | 4.7% | 101 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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