Cheapest return IAD–SJU flights, May

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

Return flights

30 May - 06 Jun United
29 May - 04 Jun Allegiant Air
30 May - 04 Jun United direct
25 May - 28 May United direct
29 May - 02 Jun Allegiant Air
25 May - 02 Jun Frontier Airlines
28 May - 02 Jun Frontier Airlines
30 May - 03 Jun Frontier Airlines
27 May - 04 Jun Frontier Airlines
29 May - 03 Jun Frontier Airlines
29 May - 07 Jun Frontier Airlines
24 May - 28 May United direct
25 May - 27 May Frontier Airlines
25 May - 29 May Frontier Airlines
29 May - 31 May Frontier Airlines
23 May - 28 May Frontier Airlines
29 May - 29 May United
23 May - 27 May Frontier Airlines
24 May - 31 May Frontier Airlines
23 May - 24 May Frontier Airlines

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

Powered by

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.

Book a cheap hotel in San Juan

Cheap car rent in San Juan

Feel free to contact us with any feedback or request another flight research.