The cheapest Madrid to Seoul return flight on the radar right now is €493, flying with Sichuan Airlines via one or more connections. It covers departures in November 2026, and every dated link below opens that exact MAD–ICN search on Skyscanner. That is roughly 20% below the €615 this route usually costs. Across 72 recorded checks it has ranged between €493 and €1,156. Our sampling points to November 2026 as the cheapest month to fly Madrid 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 Madrid? 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 Madrid to Seoul is often still worth booking within a day or two of the fare we found.