Early Booking: Up to 15% Off Barcelo Sancti Petri Spa Resort, Spain. Enjoy the great discount if you book in advance. Book your stay for 2 nights or more at Barcelo Sancti Petri Spa Resort, Spain and get up 15% off plus 1 free pass to the water circuit per adult and stay at our U Spa, the largest in Andalusia. Terms & Conditions: Offer valid until 28 October 2016 , Except of the 10 April 2017 when 15 April 2017.