The cheapest Riga to Boston return flight on the radar right now is €519, flying with KLM + Air France via one or more connections. It covers departures in March 2027, and every dated link below opens that exact RIX–BOS search on Skyscanner. The price we usually record on this route is €530. Across 77 recorded checks it has ranged between €376 and €854. Our sampling points to March 2027 as the cheapest month to fly Riga to Boston.
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 52 other departure cities for Boston, 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 Boston is often still worth booking within a day or two of the fare we found.