Cheapest return flights from Washington to San Juan in April from $165

AirHint found the following cheapest return flights from Washington (IAD) to San Juan (SJU) in April 2026 (see full year).

Return flights

11 Apr - 16 Apr Frontier Airlines
11 Apr - 15 Apr Frontier Airlines
11 Apr - 13 Apr Frontier Airlines
13 Apr - 16 Apr Frontier Airlines
20 Apr - 23 Apr Frontier Airlines
18 Apr - 24 Apr Frontier Airlines
10 Apr - 15 Apr Frontier Airlines
17 Apr - 22 Apr Frontier Airlines
24 Apr - 30 Apr Frontier Airlines
12 Apr - 17 Apr Frontier Airlines
30 Apr - 06 May Frontier Airlines
01 Apr - 01 May Frontier Airlines
30 Apr - 04 May Frontier Airlines
30 Apr - 06 May United direct
30 Apr - 04 May United direct

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

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