India, June 16 -- Thousands of Capital One customers could soon receive money as part of a $425 million settlement tied to a class-action lawsuit over lost interest. The settlement, announced in May, still needs final approval from a federal judge in Virginia.

At the center of the case are two savings accounts that Capital One offered-one older, one newer-that paid very different interest rates. Many customers said they had no idea they were missing out on higher returns.

The legal battle began when customers sued Capital One, claiming they weren't clearly told about the launch of the newer "360 Performance Savings" account, which paid much higher interest than the original "360 Savings" account. Both accounts had similar names, but dra...