Cheapest return flights from Washington to San Juan in September from 140€

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

Return flights

15 Sep - 19 Sep United
25 Sep - 28 Sep Southwest Airlines
20 Sep - 27 Sep United
08 Sep - 12 Sep United
23 Sep - 27 Sep United
09 Sep - 23 Sep United
16 Sep - 30 Sep United
23 Sep - 07 Oct United
24 Sep - 08 Oct United
30 Sep - 14 Oct United
17 Sep - 01 Oct United
20 Sep - 04 Oct United
21 Sep - 05 Oct United
22 Sep - 01 Oct Southwest Airlines
01 Sep - 01 Oct United
27 Sep - 11 Oct United
15 Sep - 29 Sep United
24 Sep - 29 Sep Southwest Airlines
08 Sep - 22 Sep United
19 Sep - 03 Oct United

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

Skyscanner

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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