The cheapest Athens to Hanoi return flight on the radar right now is €451, flying with Scoot + Air China via one or more connections. It covers departures in February 2027, and every dated link below opens that exact ATH–HAN search on Skyscanner. At 31% under the €656 we normally record here, it is one of the strongest ATH–HAN fares in our index. Across 66 recorded checks it has ranged between €451 and €1,158. Our sampling points to February 2027 as the cheapest month to fly Athens to Hanoi.
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 Athens? We track 60 other departure cities for Hanoi, 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 Athens to Hanoi is often still worth booking within a day or two of the fare we found.