The cheapest Prague to Seoul return flight on the radar right now is €608, flying with Lufthansa via one or more connections. It covers departures in January 2027, and every dated link below opens that exact PRG–ICN search on Skyscanner. Across 89 recorded checks it has ranged between €494 and €1,740. Our sampling points to January 2027 as the cheapest month to fly Prague 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 Prague? We track 61 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 Prague to Seoul is often still worth booking within a day or two of the fare we found.