airdatalink does not offer unlimited data eSIM plans for Bulgaria. All of its available plans provide a fixed data allowance, with the largest bundles offering 50 GB of high‑speed data.
The most generous fixed data options for Bulgaria are the Essential Europe eSIM — 50 GB · 30 days and the Discover Europe eSIM — 50 GB · 30 days. Both include 5G where available and cover Bulgaria plus numerous additional European countries. For travelers who need substantial data but not truly unlimited usage, such fixed plans can be more cost‑effective than higher‑priced increases or pay‑as‑you‑go options.