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

Return flights

30 Jan - 01 Feb	Spirit Airlines
29 Jan - 01 Feb	Frontier Airlines
22 Jan - 25 Jan	Frontier Airlines
22 Jan - 25 Jan	United	direct
30 Jan - 01 Feb	United	direct
29 Jan - 01 Feb	United	direct
29 Jan - 02 Feb	United	direct
18 Jan - 19 Jan	Frontier Airlines
16 Jan - 18 Jan	Frontier Airlines
27 Jan - 31 Jan	United	direct
26 Jan - 28 Jan	American Airlines
17 Jan - 29 Jan	Frontier Airlines
16 Jan - 18 Jan	United	direct
19 Jan - 26 Jan	Avianca
19 Jan - 26 Jan	United	direct

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

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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Cheapest return flights from San Juan to Washington in January from $212

Return flights