Find the hotel first, then compare across sites.
✓Pick the hotel you like on any booking site, then run it through a comparison tool to find the cheapest deal for that exact room.
Once you've settled on a hotel, run it through a tool that checks several booking sites at once and shows the cheapest deal for that exact room. Google Hotels, Trivago, Kayak and Tripadvisor all do this. We ran the test on four real hotels: see which booking site was cheapest, and whether booking direct beat it.
One catch: these comparison tools can't see your loyalty status. If you've got, say, Genius Level 3 on Booking.com, the price you actually pay can be lower than the tool quotes. So when a tool points you to the cheapest site, open that site yourself, log in, and check the real price before you book.