Find Hotel Tonight Referral Code for 2018. Get Free Promo Code $25 Off when you book hotels. Hotel Tonight promo code to use for $25 Off your first booking! How to use a promo code? Go to “Promotions” and click “Redeem a Promo Code” and enter code: LIVETHENIGHT to get $25 Off. Also when you download the hotel tonight application, you will get $25 free credit in your account. You can sign up with referral program and booking your first order. Existing users can also share your invite code here to earn the discount. Book today last minute hotel deals at Hoteltonight.