The Gunners have been handed the east side of the ground while the Blues have agreed to the west end – as fans have been given the equivalent of 80 per cent of the national stadium’s capacity.
The FA has reduced prices from last year’s final by a fiver across each band – with £45, £65, £85 and £115 tickets available for supporters.
The remaining 12,000 seats will be given to “football family” which includes volunteers from grass root level.
Kick off for the showpiece domestic event will be 5:30pm on May 27, with live coverage on BBC One and BT Sport 2 for those unlucky enough not to grab a ticket.
The Blues are aiming to win the double for the just the second time in their history – after sliding past Tottenham in the semi-finals.
A brace from Willian, and further goals from Eden Hazard and Nemanja Matic helped them beat Spurs 4-2.
Arsene Wenger’s side booked their place in the final after Alexis Sanchez’s extra time winner gave the Gunners the chance to win their 13th FA Cup.