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

Return flights

09 Nov - 13 Nov	Frontier Airlines	direct
02 Nov - 13 Nov	United	direct
11 Nov - 13 Nov	Delta
10 Nov - 13 Nov	Delta
06 Nov - 10 Nov	Frontier Airlines
11 Nov - 13 Nov	United	direct
10 Nov - 13 Nov	United	direct
03 Nov - 06 Nov	United	direct
09 Nov - 15 Nov	Frontier Airlines
13 Nov - 16 Nov	Frontier Airlines
27 Nov - 05 Dec	Frontier Airlines
30 Nov - 07 Dec	Frontier Airlines	direct
27 Nov - 01 Dec	Frontier Airlines
28 Nov - 10 Dec	United	direct
28 Nov - 03 Dec	United	direct
27 Nov - 01 Dec	United	direct

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

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 November from $161

Return flights