The sales window will stay open until 11pm on Sunday May 6.
The other 1million Olympic tickets will go on sale in mid-May.
Tickets will be available for all but five matches: Great Britain men v Uruguay, the men's quarter-final and semi-final at Wembley, and the men's and women's final at Wembley.
Organisers say they are confident that the Ticketmaster system will avoid the problem that caused sales to be suspended in January.
The system should be able to cope with selling up to 250,000 tickets an hour.
Support the USA national team with an official 2013 Centennial soccer jersey from Nike. Its Official.
The USA will wear their blue away jersey against Jamaica in their World Cup qualifier on Friday night.
England will debut their new away jersey against Brazil at the Maracana Stadium on Sunday. Get in the Gear
The hoop soccer jersey is classic and cool. The USA hooped jersey is perfect for every fan. Get in the Gear.
The Nike Hypervenom is the latest cleat silo from Nike. It will change your game and is worn by the game's top players.
Manchester City will try and win back the Premier League title with this new soccer jersey from Nike!
Jamaica is in need of a win against the U.S. Get the jersey of the Reggae Boyz.
Barcelona will wear this new home soccer jersey next season. They also have a new away jersey. Get them both.
Neymar's move from Santos to Barcelona is no doubt the biggest summer transfer.
Germany is one of the top teams ever and they will play the US on Sunday.