AirHint found the following cheapest return flights from Houston (HOU) to San Juan (SJU) in September 2025 (see full year).

Return flights

22 Sep - 26 Sep	United	direct
22 Sep - 27 Sep	United
08 Sep - 22 Sep	United
23 Sep - 07 Oct	United
26 Sep - 10 Oct	United
06 Sep - 10 Sep	Southwest Airlines
14 Sep - 28 Sep	United
16 Sep - 30 Sep	United
06 Sep - 20 Sep	United
16 Sep - 18 Sep	United
07 Sep - 13 Sep	United
17 Sep - 23 Sep	United
17 Sep - 01 Oct	United
20 Sep - 04 Oct	United
24 Sep - 08 Oct	United
18 Sep - 02 Oct	United	direct
29 Sep - 13 Oct	United	direct
21 Sep - 05 Oct	United
30 Sep - 14 Oct	United
21 Sep - 11 Oct	Spirit Airlines

Also check the deals for one-way flights from Houston to San Juan in September.

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 Houston to San Juan in September from 133€

Return flights