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

Return flights

22 Jul - 26 Jul	Southwest Airlines
23 Jul - 26 Jul	Spirit Airlines
22 Jul - 08 Aug	Spirit Airlines
23 Jul - 08 Aug	Spirit Airlines
24 Jul - 28 Jul	Southwest Airlines
22 Jul - 28 Jul	Spirit Airlines
29 Jul - 02 Aug	Southwest Airlines
24 Jul - 08 Aug	Spirit Airlines
25 Jul - 08 Aug	Spirit Airlines
17 Jul - 28 Jul	Spirit Airlines
23 Jul - 28 Jul	Spirit Airlines
07 Jul - 11 Jul	Spirit Airlines
22 Jul - 31 Jul	Spirit Airlines
09 Jul - 12 Jul	American Airlines
02 Jul - 08 Jul	American Airlines

Also check the deals for one-way flights from Milwaukee to San Juan in July.

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 July from $270

Return flights