Flight Deals from Washington Dulles Airport to San Juan from $176

Flights from Washington to San Juan are cheapest in late January and most expensive mid-December.

When planning your trip from Washington to San Juan, consider that flights tend to be most expensive around late March to early April and during the holiday season, especially mid-December, with prices peaking significantly at times like December 24. In contrast, late January offers some of the lowest fares, often seen as an optimal time to book your travel. Overall, the high season generally occurs from mid-December to early January, showing prices that can soar to $700 or more, while the low season ranges from early January to early March, where fares can drop below $400. Expect an abrupt increase in prices starting mid-March.

Book your flight from Washington to San Juan 48 to 60 days in advance for the best prices; avoid booking last minute to prevent rapid price increases.

If you're planning to travel from Washington to San Juan, the best time to book your flight is between 48 to 60 days before your departure, with the lowest prices around 52 days prior. During this period, prices can range from $430 to $552. However, after this window, prices tend to rise significantly, particularly within the last 11 days before departure, where costs can escalate to as high as $564. It's advisable to secure your ticket before 41 days to avoid the surge in prices, as waiting until the last moment can result in paying as much as 27% more.