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

One-Way flights

23 Aug	Spirit Airlines	direct
29 Aug	Frontier Airlines	direct
21 Aug	Frontier Airlines
15 Aug	Frontier Airlines	direct
22 Aug	Frontier Airlines	direct
21 Aug	Frontier Airlines	direct
14 Aug	Frontier Airlines	direct
16 Aug	Frontier Airlines	direct
05 Aug	Spirit Airlines	direct
06 Aug	Frontier Airlines

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

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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Cheapest one-way flights from San Juan to Miami in August from $73

One-Way flights