Cheapest one-way flights from San Francisco to San Juan in December from $134

AirHint found the following cheapest one-way flights from San Francisco (SFO) to San Juan (SJU) in December 2025 (see full year).

One-Way flights

08 Dec Frontier Airlines
04 Dec Frontier Airlines
15 Dec Frontier Airlines
03 Dec Frontier Airlines
28 Dec Sun Country Airlines
25 Dec Alaska Airlines
26 Dec Frontier Airlines
20 Dec Frontier Airlines

Also check the deals for return flights from San Francisco 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.

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.