Cheapest return flights from Washington to San Juan in September from 264€

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

Return flights

30 Sep - 04 Oct United direct
25 Sep - 02 Oct Frontier Airlines
20 Sep - 27 Sep Frontier Airlines
21 Sep - 22 Sep Frontier Airlines
20 Sep - 28 Sep Frontier Airlines
26 Sep - 29 Sep Frontier Airlines
21 Sep - 25 Sep Frontier Airlines
25 Sep - 28 Sep Frontier Airlines
21 Sep - 28 Sep Frontier Airlines
26 Sep - 28 Sep Frontier Airlines
20 Sep - 22 Sep Frontier Airlines
25 Sep - 27 Sep Frontier Airlines
29 Sep - 04 Oct Frontier Airlines
26 Sep - 05 Oct Frontier Airlines
28 Sep - 03 Oct United direct
28 Sep - 02 Oct United direct
25 Sep - 02 Oct United direct
29 Sep - 04 Oct United direct

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

Skyscanner

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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