Cheapest return DCA–SJU flights, September

AirHint found the following cheapest return flights from Washington (DCA) to San Juan (SJU) in September 2026 (see full year).

Return flights

03 Sep - 06 Sep Delta
04 Sep - 07 Sep Southwest Airlines
03 Sep - 07 Sep Southwest Airlines
10 Sep - 14 Sep Southwest Airlines
18 Sep - 21 Sep Southwest Airlines
24 Sep - 27 Sep Southwest Airlines
30 Sep - 05 Oct Southwest Airlines
12 Sep - 15 Sep Delta
18 Sep - 18 Sep Southwest Airlines
18 Sep - 18 Sep jetBlue direct
17 Sep - 20 Sep Southwest Airlines

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

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