Cairo Metro Line 3 stops at Heliopolis-side stations several km away; a ~9 km, seven-station extension to the airport is only being prepared (2026 reporting). Guides that hand you a metro map from the terminal are describing a future project. The nearest real metro ride means a taxi/bus hop to the Line 3 network first.
The airport page is explicit: bus departures are from 'the Bus Station located in the parking area in front Terminal 1 only.' A budget plan that says 'walk out of T3 and board 111' ends with a paid taxi to T1, cancelling the saving.
The airport's own taxi section warns tourists are targeted by 'free taxi drivers in the arrival hall' and that old black-and-white cars 'usually do not have a meter.' What you hear as a flat 'EGP 300, no problem' can end higher with invented luggage and 'airport' fees on arrival.
Legacy pages quote EGP 50–80 or '€2.90' Downtown; 2026 sources quote 150–400+ for the same trip because the EGP has slid ~4x against hard currency in four years and regulated taxi tariffs moved with it. Treat ALL EGP numbers here as bands and expect upward revision.