Cheapest return flights from Seattle to San Juan in January from 236€

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

Return flights

30 Jan - 07 Feb Frontier Airlines
12 Jan - 28 Jan Frontier Airlines
06 Jan - 22 Jan Frontier Airlines
27 Jan - 03 Feb Alaska Airlines
11 Jan - 25 Jan Frontier Airlines
18 Jan - 22 Jan United
18 Jan - 21 Jan Frontier Airlines
18 Jan - 23 Jan United
20 Jan - 29 Jan Delta
03 Jan - 08 Jan Frontier Airlines
05 Jan - 12 Jan Alaska Airlines
22 Jan - 25 Jan United

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

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.