Use Bloomberg (see access details).

• Type CACT and hit <GO>.
• Select 35) Action Types. 
• Click 12) Corporate Events, then select Delisting. Click Add -> to add Delisting to the Selected Actions list, then close the pop-up window to see results. 
• You can change the years in the amber fields.

Use WRDS (see access details)

• Select CRSP -- under Annual Update or Quarterly Update, select Stock/Events -- Delist