The cheapest Riga to San Juan return flight on the radar right now is €712, flying with airBaltic + Condor + jetBlue via one or more connections. It covers departures in February 2027, and every dated link below opens that exact RIX–SJU search on Skyscanner. That is roughly 14% below the €826 this route usually costs. Across 73 recorded checks it has ranged between €596 and €1,430. Our sampling points to February 2027 as the cheapest month to fly Riga 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 Riga? We track 54 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 Riga to San Juan is often still worth booking within a day or two of the fare we found.