I compared 24 booking sites on 47 hotels. Booking.com, Expedia and Hotels.com were ~26% above the cheapest.

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TL;DR: 47 hotels in 5 cities, 24 booking sites per hotel on average, same dates for all (12–15 Nov 2026, 3 nights, 2 adults, USD). The big names were a median 26–27% more expensive than the cheapest site for the same hotel: Booking.com +27%, Priceline +27%, Expedia +26%, Hotels.com +26%. The cheapest offer usually came from smaller sites: Super.com, Vio.com and Traveluro were cheapest on 9 hotels each. Checking Expedia, Hotels.com, Orbitz, Travelocity and CheapTickets is one check, not five. They showed the exact same price on 37 of 45 hotels (all Expedia Group).

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