How to get an order's discount amount programmatically?

You can use the getBaseDiscountAmount() and the getDiscountAmount() methods of the \Magento\Sales\Model\Order class:

The getBaseDiscountAmount() method returns a discount amount in the store’s base currency.
The getBaseDiscountAmount() method returns a discount amount in the order’s currency.

You can also directly use the base_discount_amount and discount_amount columns of the sales_order table:

See also:

• How to get an order item’s discount amount programmatically?