Use Promo code MASTERPASS and check out with master Pass
For travel till June 30th
"Book a qualifying standalone, pre-paid hotel stay for one or more nights (total cost $100 or more) with travel occurring between December 14, 2015 and June 30, 2016 via Orbitz using MasterCard via MasterPass™ as the payment method and promo code MASTERPASS, and receive $50 off your booking. Most major chains are excluded; to find participating hotels look for the "PROMO CODE ELIGIBLE" message on Orbitz.com hotel listings"