The cheapest Gdansk to Ulaanbaatar return flight on the radar right now is €950, flying with LOT + MIAT Mongolian Airlines via one or more connections. It covers departures in June 2027, and every dated link below opens that exact GDN–ULN search on Skyscanner. The price we usually record on this route is €853. Across 25 recorded checks it has ranged between €738 and €2,534. Our sampling points to June 2027 as the cheapest month to fly Gdansk to Ulaanbaatar.
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 Gdansk? We track 49 other departure cities for Ulaanbaatar, 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 Gdansk to Ulaanbaatar is often still worth booking within a day or two of the fare we found.