The cheapest Sofia to Seoul return flight on the radar right now is €733, flying with Lufthansa via one or more connections. It covers departures in February 2027, and every dated link below opens that exact SOF–ICN search on Skyscanner. The price we usually record on this route is €655. Across 82 recorded checks it has ranged between €530 and €778. Our sampling points to February 2027 as the cheapest month to fly Sofia to Seoul.
Every fare here is re-confirmed against Skyscanner automatically, and each one is stamped with the moment it was last checked, so you can see how fresh it is instead of taking it on trust. Not flying from Sofia? We track 59 other departure cities for Seoul, listed at the foot of this page.
Fares move quickly. If this Sofia to Seoul price has gone by the time you search, shift the dates a day or two either side, because the same route is often still cheap just next door.