Supporters began queuing outside the Tigers ticket office at Welford Road at 4.30am on Monday.
Hundreds of fans have been buying tickets since they went on sale from the Tigers ticket office at 8.30am on Monday.
Linda Bradshaw, a season ticket holder in the Caterpillar Stand, was one of the first fans in the queue.
Linda, who began queuing at 5.30am, said: “Who wants to miss Dublin? We have queued early over the years – it’s always fun. We want to make sure we get the tickets where we want to be.
“We are really looking forward to it. We are flying out on the Friday morning and coming back on the Monday.”
Chris Richardson, a season ticket holder on the Terrace, was also one of the first in the queue, and said: “I have been to Dublin before. It is the place for rugby and the people.”
They were joined by Ronald Williamson, a season ticket holder in the Goldsmiths Stand. He said: “It is my wife’s birthday that week so we will make a pleasant weekend of it.
“Queuing for tickets is part and parcel of being of a Tigers fan and it is one of the reasons you like coming down.”
The club has an allocation of 12,500 tickets for the match at the Aviva Stadium in Dublin on Saturday, April 9 (6pm).
Tickets are available exclusively to season ticket holders and are restricted to two per person for the first two days of sale (Monday and Tuesday).
Season ticket holders will be able to purchase up to a further four tickets after this period.
Tigers members will be able to purchase tickets from 8.30am on Wednesday, two tickets per person.
Tickets are priced at 30, 35, 40, 50,60 and 70 euro (£26-£62, payment is in pound sterling).
If any tickets remain after sales to season ticket holders and members, we will provide further information for general sales at a later date.
Leinster v Leicester Tigers, Saturday April 9, ticket sales details:
Monday February 14: Tigers season ticket holders only, 2 tickets per season ticket holder
Tuesday February 15: Tigers season ticket holders only, 2 tickets per season ticket holder
Wednesday February 16: Tigers season ticket holders, up to an additional 4 tickets per season ticket holder (maximum of 6 tickets total)
Wednesday February 16: Paid club members, 2 tickets per membership
Thursday February 17-Sunday, February 20: As above
Ticket prices & locations (subject to availability)
70/ £62 Blocks 329 & 330
60/ £53 Blocks 301, 316 & 331
50 / £44 Blocks 505, 506, 507, 523, 524, 525, 526, 527 & 528
40 / £35 Blocks 522, 523, 524, 525, 526, 527, 528 & 529
35 / £31 Blocks 120, 504, 505, 506, 507, 513, 516, 524, 525 & 526
30 / £26 Blocks 519, 520 & 521
There are no concession or junior tickets available for this game.
Children aged under two years sitting on a parent's lap will need a ticket. These are free of charge and can be obtained from the ticket office outside Aviva Stadium from 9am on matchday. Stadium regulations do not permit children under two years in the upper tier for health and safety reasons.
Tickets will be available online (to season ticket holders only) via the ticket hotline 0844 856 1880 or in person from the Tigers ticket office.
Tickets purchased online will be the best available in the price category, allocated by the ticket office. Supporters will be able to select price catergory but not specific blocks online.
Tigers Travel Club packages are also available for this game. Click here for more details.
For a map of the Aviva Stadium, click here.