Budapest has an excellent integrated public transport system operated by BKK, including metro (4 lines), trams, buses, trolleybuses, and boats. Single tickets cost 350 HUF (~€0.90); validate upon boarding. Travel cards offer better value: 24-hour (1,650 HUF), 72-hour (4,150 HUF), 7-day (4,950 HUF). The Budapest Card includes unlimited transport plus museum discounts and free walking tours.
Tram 2: Runs along the Pest Danube embankment - considered one of the world's most scenic tram routes with constant Parliament and castle views.
Trams 4 & 6: Circle the Grand Boulevard, connecting major districts and transport hubs.
Tram 19 & 41: Connect Buda side sights including Buda Castle and Gellért Bath.
100E Airport Bus: Direct service to city center (40-50 min), special ticket required (2,200 HUF), runs every 30 minutes.
Taxi/Ride-share: Fixed-price taxis at airport (~7,500-9,000 HUF to center), or use Bolt/Uber apps.
Funicular (Sikló): Historic cable railway from Chain Bridge (expensive but fun).
Bus 16: Climbs Castle Hill from multiple stops.
Walking: Steep but scenic paths from Danube embankment.