Prices range from £20 to £2,012 and oversubscribed events will be decided by a ballot. On Monday a giant clock counting down the days until the start of the Games was unveiled in Trafalgar Square.
Lord Coe, the chairman of London 2012, said:
“If you look at the way we have put the price points together I think we’ve done that in a really smart way. I think those prices are affordable. Yes, the big ticket events are always going to be the big ticket events, but there are plenty of opportunities to see the big stars at the lower price points.”
Lord Coe said he was confident the Games would be a sellout.
Organisers said they were confident they had done everything they could to avoid the website crashing as people log on for the first time to buy tickets.
The main factor is the establishment of a 42-day sales process which means each application between now and 26 April will be treated in exactly the same way.
People can apply using a paper form obtainable from branches of Lloyds TSB in England, Bank of Scotland in Scotland or libraries in Northern Ireland between 15 March and 25 April 2011.
Sean and Jacqueline Burke, from Southwell, Nottinghamshire, reported some problems using the website.
Mr Burke told BBC News:
“We have managed to book tennis and athletics and one of the cycling events but we have had one or two problems with the website crashing. Logistically it’s quite tricky at the moment.”