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

Return flights

18 Oct - 21 Oct	Delta
04 Oct - 07 Oct	Delta
02 Oct - 05 Oct	Delta
08 Oct - 11 Oct	Delta
03 Oct - 05 Oct	Delta
03 Oct - 06 Oct	Southwest Airlines
15 Oct - 20 Oct	Southwest Airlines
08 Oct - 15 Oct	United
04 Oct - 18 Oct	United
01 Oct - 15 Oct	United
25 Oct - 08 Nov	United
31 Oct - 14 Nov	United
20 Oct - 03 Nov	United
21 Oct - 04 Nov	United
24 Oct - 07 Nov	United
29 Oct - 12 Nov	United
19 Oct - 02 Nov	United
22 Oct - 05 Nov	United
18 Oct - 01 Nov	United
23 Oct - 06 Nov	United

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

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 Washington to San Juan in October from 183€

Return flights