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	Southwest Airlines
18 Oct - 23 Oct	Southwest Airlines
20 Oct - 24 Oct	Southwest Airlines
01 Oct - 01 Oct	Delta
03 Oct - 06 Oct	Southwest Airlines
22 Oct - 26 Oct	Southwest Airlines
14 Oct - 18 Oct	Southwest Airlines
15 Oct - 18 Oct	Southwest Airlines
15 Oct - 23 Oct	Southwest Airlines
16 Oct - 18 Oct	Southwest Airlines
31 Oct - 08 Nov	Southwest Airlines
22 Oct - 08 Nov	Southwest Airlines
29 Oct - 01 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 255€

Return flights