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

Return flights

20 Oct - 26 Oct	Southwest Airlines
20 Oct - 24 Oct	Delta
23 Oct - 26 Oct	Southwest Airlines
20 Oct - 23 Oct	Delta
20 Oct - 30 Oct	Delta
26 Oct - 06 Nov	Southwest Airlines
30 Oct - 01 Nov	Southwest Airlines
30 Oct - 04 Nov	Southwest Airlines
02 Oct - 09 Oct	Delta
05 Oct - 11 Oct	Delta
03 Oct - 11 Oct	Delta
30 Oct - 05 Nov	Delta
03 Oct - 11 Oct	jetBlue	direct
01 Oct - 01 Oct	Delta
30 Oct - 03 Nov	Southwest Airlines
31 Oct - 04 Nov	Delta

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 184€

Return flights