How long on the tube from balham to heathrow terminal 4?

The journey from Balham to Heathrow Terminal 4 typically takes around 45 to 60 minutes by tube, depending on the time of day and any potential delays. You would usually take the Northern Line to Leicester Square, then change to the Piccadilly Line, which directly serves Heathrow. Be sure to check for any service changes or delays that might affect your travel time.