Due to popular demand, the tickets have been made available earlier than originally planned today (May 1), after exclusive pre-sale tickets were offered last week (April 23).
A limited number of tickets can now be booked via Ticketmaster's NTA page or by calling 0844 847 2536.
This year's NTA winners included Matt Smith, Karen Gillan, Ant & Dec and Alan Carr.
The next National Television Awards will be held at London's O2 Arena on January 23, 2013.
> National Television Awards winners list - In Full
Photo gallery - view pictures from this year's National Television Awards below: