AirHint found the following cheapest return flights from Milwaukee (MKE) to San Juan (SJU) in August 2025 (see full year).

Return flights

16 Aug - 22 Aug	Southwest Airlines
18 Aug - 22 Aug	Spirit Airlines
08 Aug - 22 Aug	Spirit Airlines
18 Aug - 25 Aug	Spirit Airlines
06 Aug - 22 Aug	Spirit Airlines
06 Aug - 08 Aug	Spirit Airlines
16 Aug - 25 Aug	Spirit Airlines
21 Aug - 22 Aug	Spirit Airlines
18 Aug - 26 Aug	Spirit Airlines
08 Aug - 25 Aug	Spirit Airlines
27 Aug - 03 Sep	Delta

Also check the deals for one-way flights from Milwaukee to San Juan 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 return flights from Milwaukee to San Juan in August from $226

Return flights