Puerto Rico is a US territory, so US citizens fly there without a passport, and flights are treated as domestic. Historic Old San Juan, El Yunque rainforest and beaches around the island make it one of the Caribbean's best-value trips.
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Major US airlines, including low-cost carriers, serve San Juan from many mainland cities, making it one of the most competitive Caribbean routes.
Winter is peak season. Late spring, early summer and the fall months usually bring lower fares; hurricane season runs June through November.
US citizens flying from the US mainland do not need a passport; a valid government-issued ID is enough for domestic flights.
Luis Muñoz Marín International (SJU) in Carolina, just east of San Juan.
Fares are often lower from late spring through fall, outside the winter peak and holidays.
