Third-party hotel booking sites can offer significant savings, but hidden fees frequently erode those discounts. Resort fees, which are often not included in the advertised rate, can add $30 to $75 per night at popular destinations. Always check the total price including all mandatory fees before comparing across platforms.

Several booking sites now offer "total price" display options. Kayak's price transparency filter and Google Hotels' default all-in pricing make it easier to compare true costs. Additionally, booking directly with hotel chains often provides better cancellation policies, loyalty points, and price-match guarantees that third-party sites cannot offer.

For international travel, watch for currency conversion fees charged by foreign-based booking platforms. Using a credit card with no foreign transaction fees and booking in the local currency can save an additional 3-5% on overseas hotel stays.