There is a new website that can help. It’s called Hotel WiFi Test.
This website helps you search, by city or individual hotel, and reports on their average wifi speed. This data is collected from previous guests who have run speed tests right on the Hotel WiFi Test website. (It’s suggested you also run a speed test on their site, if you’re staying in a hotel, to help other travelers with their searches.)
And there’s one other cool part. You can add a browser extension to your favorite browsers that will add known wifi speeds to hotel listings on Hotels.com, Expedia, Booking.com and TripAdvisor.