The Sunday Times becomes Britain's first £2 paper this weekend and the Times is also raising its cover price, as News International looks to recoup its investment in new freesheet the London Paper.
Meanwhile, the Telegraph Group - which is about to move into new premises with an integrated digital newsroom - is also raising the cost of its titles.
The Sunday Telegraph increases by 20p to £1.80, while the Saturday edition of the Daily Telegraph goes up 10p to £1.40 from tomorrow, meaning it will join the Independent as the costliest paper that day.
From Monday to Friday, the Telegraph will cost 70p, up 5p, taking it to the same level as the Guardian and the Independent.
The Times will remain cheaper than its rivals, but goes up 5p to 65p. On Saturday, it will increase by 10p to £1.30, the same price as the Guardian.
The Sunday Times, which leads the quality market with sales of 1.35m, is raising its cover price by 20p from £1.80 to £2.00.
The Observer and the Independent on Sunday are both priced £1.70.
The Mail on Sunday is also joining in the price rise, going up by 10p to £1.40, but the Daily Mail will stay at 45p.
Newspapers have become markedly more expensive in recent years as executives attempt to recover the losses of the price war a decade ago.
Although circulations are falling across the board, newspapers can maintain their revenues by increasing cover prices.
However, the Sunday Times' decision to increase its price to £2 risks causing a dent in circulation.
"I'm worried in the sense that it's a ground-breaking price - there's never been a British newspaper at £2 - but I'm not worried that our readers won't think it's value for money," said Paul Hayes, the managing director of Times Newspapers.
The Sunday Times will cushion its price rise by giving away a free Jimi Hendrix CD and launching a new section, In Gear, which is aimed at male readers.
In Gear will incorporate the old Driving section and also cover technology and extreme sports.
One possible side-effect of the weekend price rises is that readers will ditch a second paper as they decide it has become too costly to buy more than one title, especially now they have become so bulky.
The Sunday Times pioneered the "supermarket" approach to weekend newspapers, with supplements covering all manner of subjects designed to obviate the need for multiple purchases.
Its famous slogan, first used during Andrew Neil's editorship - "The Sunday Times is the Sunday papers" - encapsulated the title's attempt to become the definitive Sunday quality read.
