This is the Oval ticket website.
As far as the 2019 Cricket World Cup goes, tickets sold incredibly quickly. The ICC will be launching an official resale site, but in the meantime you can buy tickets here.
The Oval Cricket Ground
The Oval Cricket Ground – also known as the Kennington Oval and The Kia Oval (and formerly the Brit Oval) – is Surrey’s home ground. It is almost always the venue for the last Test of the summer and will typically host at least one ODI as well.
The capacity is currently around 23,500, but Surrey have announced plans to expand this by another 2,000, although Ashes tickets will still be at a premium even once this work is complete. The Oval is significant in that the first Test cricket match in England took place here in 1880. Additionally, it was England’s defeat to Australia here in 1882 that led to the creation of the Ashes.