For years, San Juan could do no wrong. Luis Muñoz Marín International Airport racked up record after record as mainland Americans flooded into Puerto Rico. That run has ended: newly released airport data shows passenger numbers fell 5.1 percent in August, extending a decline that has now stretched across all eight months of 2026.
The raw figures tell the story. August brought 1,126,633 passengers through San Juan, roughly 60,000 fewer than the same month last year. Year to date, the total sits at 9,422,571 — a 3.4 percent drop that translates to nearly 335,000 missing travellers compared with 2025.
What makes this unusual is that both sides of the airport's business are shrinking at once. Domestic traffic — overwhelmingly the busy US mainland routes that powered Puerto Rico's post-pandemic boom — fell 4.9 percent in August and is down 3.6 percent for the year, from 8.55 million passengers to 8.24 million. International arrivals dropped 5.9 percent in August too, leaving the year-to-date international count off 2 percent.
The contrast with the rest of the Caribbean makes Puerto Rico's slide stand out even more. The Dominican Republic is having a banner year, with traffic at Aerodom's airports up roughly 10 percent in the first half, and Santo Domingo, Puerto Plata and Samaná all posting gains. Elsewhere the picture is messier — Jamaica is dealing with hotel closures after Hurricane Melissa, and Cancun has seen international numbers fall sharply. But Puerto Rico shares neither Jamaica's storm damage nor Cancun's reliance on long-haul international markets. Its weakness is concentrated in exactly the domestic US segment that fuelled its growth, which suggests something destination-specific is going on rather than a region-wide slump.
For travellers, this is quietly good news. San Juan still has more nonstop connectivity than almost any island in the Caribbean, and softer demand often means better fare deals, wider hotel availability and thinner crowds at old San Juan's forts and restaurants — at least in the short term. Whether airlines begin trimming routes if the trend continues is the big open question, which is why these monthly numbers have become one of the region's most-watched indicators.
After a half-decade in which every traffic report seemed to bring another record, the trajectory has flipped. If you've been putting off a Puerto Rico trip, the current lull might be the window to go.