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

Return flights

09 Sep - 11 Sep	Southwest Airlines
07 Sep - 11 Sep	Southwest Airlines
06 Sep - 11 Sep	Southwest Airlines
17 Sep - 21 Sep	Southwest Airlines
25 Sep - 29 Sep	Southwest Airlines
18 Sep - 22 Sep	Southwest Airlines
05 Sep - 11 Sep	Southwest Airlines
11 Sep - 13 Sep	Southwest Airlines
10 Sep - 14 Sep	Southwest Airlines
12 Sep - 14 Sep	Southwest Airlines

Also check the deals for one-way flights from Dallas 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 Dallas to San Juan in September from 287€

Return flights