The airport is formally divided into two terminals - 2A and 2B, but in reality it is only one building. At the entrance, the check-in counters of Terminal 2A are on the right, while those of Terminal 2B are on the left, see the airport map.
Terminal 1, which is on the other side of the airport, has not been used for a long time.
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There are security checkpoints at three locations, but they all lead to the central transit area to all departure gates.
Terminal 2 is quite large, so don't leave your arrival at the airport to the last minute. The ideal time before departure is at least 1.5 to 2 hours.
Transfer between flights
As no network carrier is based in Budapest, the airport is not a major transfer point.
If you fly in from Schengen countries and continue on to Schengen countries again, you do not need to leave the transit zone. You do not go through passport or security control.