Hello there

I am planning a family holiday from the UK to San Francisco for the first two weeks of July in 2015.

Booking for most common airlines is available now for a range of £794 - £1100 per person in economy inclusive of all taxes.

My question is this:- Is there an optimum time to book for best prices (with money, as I don't have enough points).

Book now or wait 6 months etc?
Will the prices dramatically reduce from the £794 typically.

I searched the web to find various different opinions - some saying 54 days before seemed to be the optimum, but I don't want to risk leaving it that late when booking for 4 people. Anyway, I think I would value the opinions of the community here more

Appreciate your views.