The cheapest Tallinn to Seoul return flight on the radar right now is €685, flying with LOT via one or more connections. It covers departures in January 2027, and every dated link below opens that exact TLL–ICN search on Skyscanner. The price we usually record on this route is €648. Across 94 recorded checks it has ranged between €523 and €697. Our sampling points to January 2027 as the cheapest month to fly Tallinn to Seoul.
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 Tallinn? We track 62 other departure cities for Seoul, 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 Tallinn to Seoul is often still worth booking within a day or two of the fare we found.