Before you delete a peering connection, you must delete routes of the initiator and acceptor.

Step 1: Delete routes

To delete a custom route, perform the following steps:
  1. Log on to the Express Connect console.
  2. In the left-side navigation pane, choose VPC Peering Connections > VPC-to-VPC.
  3. Select the region of the peering connection that you want to delete and find the peering connection.
  4. Click the VPC ID of the initiator. On the VPC Details page, click the VPC ID again.
  5. In the Network Resources section, click the number following Route Table. On the Route Tables page, click the route table ID.
  6. Find the custom route whose destination is the CIRD block of the on-premises data center and click Delete in the Actions column.
  7. In the Delete Route Entry dialog box, click OK.
  8. Repeat the preceding steps to delete the route of the acceptor.

Step 2: Delete the peering connection

To delete a peering connection, perform the following steps:
  1. Log on to the Express Connect console.
  2. In the left-side navigation pane, choose VPC Peering Connections > VPC-to-VPC.
  3. Select the region of the peering connection that you want to delete and find the peering connection.
  4. Click and select Suspend Initiator. In the Suspend Instance dialog box, click Confirm.
  5. Click and select Suspend Acceptor.In the Suspend Instance dialog box, click Confirm.
  6. Click and select Delete. In the Delete Peering Connection dialog box, click Confirm.