The cheapest Geneva to San Juan return flight on the radar right now is €683, flying with Iberia via one or more connections. It covers departures in February 2027, and every dated link below opens that exact GVA–SJU search on Skyscanner. Across 35 recorded checks it has ranged between €550 and €936. Our sampling points to February 2027 as the cheapest month to fly Geneva to San Juan.
Prices are re-checked against Skyscanner automatically, and every one shows when it was last confirmed, so nothing here is older than it looks. Not flying from Geneva? We track 52 other departure cities for San Juan, listed at the foot of this page.
Prices like this tend to vanish fast. If it has gone when you look, try the days either side of the dates above, since Geneva to San Juan is often still worth booking within a day or two of the fare we found.