The cheapest Zagreb to Bangkok return flight on the radar right now is €555, flying with Air China via one or more connections. It covers departures in December 2026, and every dated link below opens that exact ZAG–BKK search on Skyscanner. At 25% under the €744 we normally record here, it is one of the strongest ZAG–BKK fares in our index. Across 106 recorded checks it has ranged between €489 and €1,898. Our sampling points to December 2026 as the cheapest month to fly Zagreb to Bangkok.
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 Zagreb? We track 64 other departure cities for Bangkok, 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 Zagreb to Bangkok is often still worth booking within a day or two of the fare we found.