In fact most of these companies use a system of sophisticated algorithms that control prices consisting of the high-low, the profit margins, and the supply — narrowing any price differences among the competing websites. Prices vary more based on the day, date, and supply rather than the booking site you use.
Here’s a glimpse of the major companies and the websites they own :
Expedia Inc.: Owns Expedia.com, Hotels.com, Hotwire.com, Venere.co, TripAdvisor.com. TripAdvisor subsidiaries include CruiseCritic.com, BookingBuddy.com, SmarterTravel.com, SeatGuru.com, AirfareWatchdog.com and IndependentTraveler.com