Cheapest return flights from Washington to San Juan in May from $188

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

Return flights

02 May - 07 May Frontier Airlines
02 May - 08 May Frontier Airlines
01 May - 09 May Frontier Airlines
11 May - 15 May Frontier Airlines
03 May - 08 May Frontier Airlines
04 May - 09 May Frontier Airlines
04 May - 08 May Frontier Airlines
10 May - 14 May Frontier Airlines
09 May - 10 May Frontier Airlines
07 May - 09 May Frontier Airlines
25 May - 08 Jun United direct
27 May - 04 Jun United
28 May - 02 Jun United
27 May - 01 Jun United
27 May - 04 Jun United direct
28 May - 01 Jun United
24 May - 01 Jun United

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

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