The Magpies have been allocated just over 1,300 tickets for the trip to Tynecastle on Friday 14th July, with kick-off in Edinburgh scheduled for 7:45pm.
Tickets were priced at £20 for adults and £10 for over-65s and under-18s and initially went on sale to season tickets with 100 or more away points.
The final few tickets were sold on Monday morning.
Supporters under the age of 13 must be accompanied by an adult.
To secure your seat for future games, please visit tickets.nufc.co.uk, call 0844 372 1892 (calls cost 7p per minute plus your network access charge) or visit the St. James’ Park Box Office in person.
Supporters can see a full list of United’s pre-season fixtures here.