Complete Airport Transfer Route: Take express bus 783 from Henri Coandă Airport (OTP) directly to Gara de Nord station (45 minutes, 8.60 RON). From Gara de Nord, board M4 metro line for instant access to central Bucharest. Total cost: 14.60 RON vs minimum 60 RON taxi fare.

M4 Line Specifications: 14.5km route with 12 stations running northwest-southeast through city core. Key destinations: Gara de Nord (northern terminus), Basarab (financial district), 1 Mai (residential), Parc Bazilescu (southern terminus). Operating hours: 5:00am-midnight daily, trains every 4-6 minutes peak hours.

Strategic Transfer Points: At Gara de Nord, connect to M1 (red line) for airport express bus continuation or M2/M3 access. For Old Town: ride M4 to Universitate then transfer to M2 yellow line (2 stops to Piața Universității). Ticket machines accept contactless payment — Buy 2-journey tickets (12 RON) to cover both bus and metro legs.

Critical Update: M4 airport extension remains under construction through 2025 despite appearing on some tourist maps. Current terminus is Gara de Nord only — Plan the bus connection accordingly. Download Metrorex official app for real-time delays and service updates.