Cheap flights from Washington to San Juan
2 airport pairs connect Washington and San Juan: BWI–SJU and IAD–SJU. Frontier Airlines, Southwest Airlines and United Airlines fly nonstop. The cheapest fare found was $128, on BWI–SJU.
Washington to San Juan: every airport pair compared
| Route | Nonstop airlines | Flights a week | Time in the air | Cheapest fare found |
|---|---|---|---|---|
| Baltimore → San Juan Luis Munoz Marin BWI–SJU |   Frontier Airlines, Southwest Airlines | 12 | 3h 34m | $128 |
| Washington Dulles → San Juan Luis Munoz Marin IAD–SJU | Frontier Airlines, United Airlines | 3 | 3h 23m | — |
Each route has its own guide with airlines, connections, the return flight and how to get into town.
Washington to San Juan fares by month
Cheapest one-way fare found: $128 for November 2026 on Frontier Airlines, nonstop. Nonstop from $128.
- Nov ’26$128
- Jan ’27$160
Cheapest one-way fares per month of departure in the Aviasales price cache, found . Fares change by the hour: the live fare is shown when you search. Cheapest of all the airport pairs above, per month.
Washington to San Juan: frequently asked questions
How much is a flight from Washington to San Juan?
From $128 one-way, the cheapest fare found (BWI–SJU, November 2026; found 8 October 2026).
Which airports can I fly between Washington and San Juan?
2 airport pairs: BWI–SJU and IAD–SJU.
Which airlines fly nonstop from Washington to San Juan?
Frontier Airlines, Southwest Airlines and United Airlines.
How long is the flight from Washington to San Juan?
3h 23m in the air on IAD–SJU, the median of tracked flights.
How many flights a week are there from Washington to San Juan?
About 14 nonstop flights a week each way across 2 airport pairs, from tracked flights over the last 28 days.