Cheapest return flights from Washington to San Juan in December from 155€

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

Return flights

11 Dec - 14 Dec Frontier Airlines direct
05 Dec - 14 Dec Frontier Airlines
06 Dec - 14 Dec Frontier Airlines
12 Dec - 15 Dec Frontier Airlines
04 Dec - 09 Dec Frontier Airlines
05 Dec - 09 Dec Frontier Airlines
05 Dec - 08 Dec Frontier Airlines
12 Dec - 15 Dec United direct
04 Dec - 09 Dec United direct
29 Dec - 12 Jan Frontier Airlines
28 Dec - 11 Jan Frontier Airlines
17 Dec - 22 Dec Frontier Airlines
30 Dec - 02 Jan Frontier Airlines direct
17 Dec - 02 Jan Frontier Airlines
18 Dec - 06 Jan Frontier Airlines
29 Dec - 03 Jan Frontier Airlines direct
28 Dec - 04 Jan Frontier Airlines direct
18 Dec - 04 Jan Frontier Airlines
28 Dec - 03 Jan Frontier Airlines direct
23 Dec - 02 Jan Frontier Airlines direct

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

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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