Tickets are on sale through the Tigers ticket office up to Friday and there will also be ticket sales at the Millennium Stadium on Saturday before kick-off.
Tigers meet Sale Sharks in the semi-final (2.30pm kick-off) with Ospreys against Cardiff Blues as the other half of the day's double-header (5.15pm kick-off).
Tigers reached the last four of the competition for a second successive year after recording bonus-point victories over Newport Gwent Dragons and Worcester Warriors in their pool matches, while Sale Sharks had a 100-per-cent record after beating Newcastle Falcons, Llanelli Scarlets and NEC Harlequins.
Adult tickets are priced at £28, with juniors at half price. Both semi-final matches are included in the ticket.
Call into the Tigers Ticket Office or call 08701 28 34 30.