United Airlines is the most reliable airline on the IAH to SJU route with a 81% on-time rate, compared to Spirit Airlines at 76%. Based on 2,962 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: IAH to SJU
Houston to San Juan — airline reliability comparison
On-Time Rate by Airline
United Airlines81%
Spirit Airlines76%
IAH to SJU Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 81% | 0.7% | 63m | 2,962 |
| Spirit AirlinesNKWorst | 76% | 2.3% | 62m | 304 |
Route Overview
80%
Overall On-Time
65m
Avg Delay
0.9%
Cancel Rate
3,293
Total Flights
Flying out of IAH? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.