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

One-Way flights

08 Sep	United	direct
15 Sep	United	direct
09 Sep	United
22 Sep	Southwest Airlines
18 Sep	Spirit Airlines	direct
14 Sep	Spirit Airlines	direct
07 Sep	Spirit Airlines	direct
11 Sep	Spirit Airlines	direct
21 Sep	Spirit Airlines	direct
22 Sep	United	direct

Also check the deals for return 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.

Book a cheap hotel in San Juan

Cheap car rent in San Juan

Cheapest one-way flights from Houston to San Juan in September from 66€

One-Way flights