Ctrip Voucher Code For December 2017: 12.12 Sale - Save big in Thailand. USD 22 for any booking exceeding USD 366. Promo code is valid for hotel bookings in Japan, South Korea, Thailand, the Philippines, Vietnam, Singapore, and Malaysia. You need to apply the promo code to avail the discount. Promo codes are only valid for paying prepaid rooms in USD. Grab Your Limited Hotel Promo Code NOW!