Cheapest one-way flights from Boston to San Juan in August from $78

AirHint found the following cheapest one-way flights from Boston (BOS) to San Juan (SJU) in August 2025 (see full year).

One-Way flights

10 Aug Spirit Airlines direct
05 Aug Frontier Airlines
23 Aug Frontier Airlines
21 Aug Frontier Airlines
25 Aug Frontier Airlines
24 Aug Frontier Airlines
02 Aug Frontier Airlines
30 Aug Frontier Airlines
31 Aug Frontier Airlines
09 Aug Frontier Airlines

Also check the deals for return flights from Boston to San Juan in August.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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