Both finalists get the same allocation for the event at the 12,000 capacity stadium, with numbers limited as the ERC has been selling tickets since September.
Saints are giving priority to season ticket holders who attended last Friday’s semi-final success against Harlequins.
Those supporters enjoy a priority booking period that lasts until this Friday at noon, after which other season ticket holders will then have between 9am on Saturday, May 3 and 5pm on Tuesday, May 6.
Any remaining tickets then go on sale from 12noon on Wednesday, May 7.
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The Saints ticket office will be taking orders online and in person from 12noon on Tuesday, April 29 and with club unsure of when it can expect to receive the physical tickets, they will be posted out.
Ticket prices range from £20 for the terraces and £40-£45 for seated areas.
Full details can be found at northamptonsaints.co.uk.