The semi-finals and final will be played at the Twickenham Stoop, home of English Premiership club Harlequins, on Wednesday, September 1 and Sunday, September 5 respectively.
IRB Chairman Bernard Lapasset said: "The Women's Rugby World Cup is the pinnacle of the Women's game, bringing together the world's finest players from 12 nations in a three-week festival that will clearly demonstrate the ever-advancing strength of Women's rugby.
"There are more women playing rugby than ever before, attendances continue to rise and the announcement of this exciting ticket policy together with 10 live matches from Sky Sports as host broadcaster and provision to stream matches live on rwcwomens.com, will mean more people than ever will have access to the tournament."
Ireland completed their RBS Women's 6 Nations campaign in Ashbourne on Friday, beating Scotland 15-3 to match last year's historic third-place finish in the Championship.
Speaking after the game, head coach Kevin West said: "I'm very happy with the year so far. We are third in the Championship and we've only done that once before and we've done it using a squad.
"It's my first RBS Women's 6 Nations and I have learned so much. I can watch lots of videos but to see the teams in action first hand is fantastic.
"We have some time off now and then we've got a number of official training camps. But knowing the girls and their dedication, there will be a lot of unofficial training going on too!
"The Six Nations has been great in showing us what we need to do to be ready for the World Cup."
Ireland centre Joanne O'Sullivan, who won her 50th cap against the Scots, added: "We're happy with how the Championship went for us this year - three wins from five matches.
"Having the summer to work on our skills and game-plans will be good preparation for the World Cup."