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

Return flights

07 Oct - 09 Oct	jetBlue
23 Oct - 27 Oct	jetBlue
16 Oct - 23 Oct	jetBlue
18 Oct - 25 Oct	jetBlue
09 Oct - 12 Oct	jetBlue
01 Oct - 05 Oct	jetBlue
19 Oct - 22 Oct	jetBlue
01 Oct - 15 Oct	United
02 Oct - 16 Oct	United
04 Oct - 18 Oct	United
20 Oct - 03 Nov	United
21 Oct - 04 Nov	United
22 Oct - 05 Nov	United
23 Oct - 06 Nov	United
24 Oct - 07 Nov	United
25 Oct - 08 Nov	United
19 Oct - 02 Nov	United
18 Oct - 01 Nov	United
27 Oct - 10 Nov	United
26 Oct - 09 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 $302

Return flights