No, you can't. P&O Ferries sets a limitation for the use of Promo Codes for a single order. That's to say, only one P&O Ferries Coupon Codes can be used per order. But no matter what kind of P&O Ferries Discount Codes it is, P&O Ferries will use them as a way to bring convenience to customers in order to make customers more like shopping in P&O Ferries.