The Times and Sunday Times now have more than 300,000 paid digital-only subscribers between them.
The titles, which both publish at thetimes.co.uk and on The Times mobile app, reached the milestone in June.
They now have 304,000 paid digital-only subscribers, up 19 per cent year-on-year, for a total of 539,000 paying subscribers (including print).
Digital subscribers pay £26 a month after an £8 two-month trial period.
The newsbrands also have some 5m “registered access” users who are able to read two free articles per week by signing up with an email account.
Chris Duncan, managing director of Times Newspapers, said the two titles “continue to show that people value quality journalism and are prepared to pay a premium for news they can trust”.