Cheapest one-way flights from Boston to San Juan in September from 102€

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

One-Way flights

21 Sep Frontier Airlines
24 Sep Spirit Airlines
27 Sep Spirit Airlines
23 Sep Spirit Airlines
29 Sep Spirit Airlines
25 Sep Frontier Airlines
20 Sep Frontier Airlines
21 Sep Delta direct
23 Sep Delta direct
29 Sep Delta direct

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

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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