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

Return flights

19 Aug - 27 Aug	Spirit Airlines
11 Aug - 16 Aug	Southwest Airlines
20 Aug - 27 Aug	Southwest Airlines
11 Aug - 27 Aug	Spirit Airlines
04 Aug - 08 Aug	United
01 Aug - 07 Aug	Spirit Airlines
02 Aug - 07 Aug	Spirit Airlines
04 Aug - 09 Aug	Spirit Airlines
19 Aug - 26 Aug	Spirit Airlines
20 Aug - 26 Aug	Spirit Airlines
19 Aug - 02 Sep	Spirit Airlines
20 Aug - 02 Sep	Spirit Airlines
28 Aug - 02 Sep	Spirit Airlines
22 Aug - 02 Sep	Spirit Airlines

Also check the deals for one-way flights from Kansas City 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 Kansas City to San Juan in August from $334

Return flights