United Airlines is the most reliable airline on the SJU to IAD route with a 88% on-time rate, compared to Frontier Airlines at 72%. Based on 1,790 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SJU to IAD
San Juan to Washington — airline reliability comparison
On-Time Rate by Airline
United Airlines88%
Frontier Airlines72%
SJU to IAD Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 88% | 0.6% | 63m | 1,790 |
| Frontier AirlinesF9Worst | 72% | 1.4% | 62m | 78 |
Route Overview
86%
Overall On-Time
67m
Avg Delay
0.7%
Cancel Rate
1,894
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.