Take the red line metro (M2) toward Deli Railway Station (Déli pályaudvar) and travel to Deák Ferenc square (3 stops). From there its just a few meters walk.

Take the the blue metro (M3) numberto Deák Ferenc square. From there its just a few meters walk.

Take the red line metro (M2) toward Örs Vezér square and travel to Deák Ferenc square (4th stops).

Take the blue line metro (M3) toward Úpest-központ and travel till Deák Ferenc square (6th stop). From there its just a few steps walk.

(it is about 40–50 minutes) Take the airport bus (Repter Bus Nr 200) which takes you to Kõbánya Kispest metro station, then switch to the blue metro (M3) for 10 stops to Deák Ferenc square. From there its just a few meters walk.