Tigers qualified for the final with a 29-19 victory over Sale Sharks at Cardiff's Millennium Stadium on Saturday, while Ospreys overcame Welsh rivals Cardiff Blues 27-10 on the same afternoon.
Tuesday March 27-Thursday March 29
Tickets on sale to Tigers season ticket holders, Guinness season ticket holders and members only. No number restrictions, subject to availability.
Friday, March 30 onwards
Tickets on general sale. No number restrictions, subject to availability.
Adults £40 & £25
Juniors £20 & £10
How to buy:
Book in person through the Tigers ticket office at Welford Road, by telephone on 08701 28 34 30 or through the club website at www.leicestertigers.com
Tigers are also arranging travel packages to the game at Twickenham.
Prices are; members & season ticket holders £17, non-members £20. Book through the Tigers ticket office as above.