From Gatwick Airport:
 

1.From Gatwick Airport, board the Gatwick Express
train to Victoria station. The cost is £ 9 for a one-
way ticket, or £ 18 for a return ticket, and the
journey time to Victoria is 45 minutes. Follow directions
from Victoria Station. Prices may vary.

2.National express coach to Victoria coach station. Cost £ 6.60 one-way.