In 2024, the market size of the online travel industry worldwide amounted to an estimated 654 billion U.S. dollars, showing an annual increase in revenue of 8.1 percent. This figure was forecast to grow steadily in the following years, reaching an estimated 1.06 trillion U.S. dollars by 2030. What are the leading online travel companies worldwide? When looking at the market capitalization of leading online travel companies worldwide, Booking Holdings reported the highest figure in 2025, ahead of Airbnb and Trip.com Group. The firm, which owns brands like Booking.com, Kayak, and Priceline, also topped the ranking of the leading online travel agencies (OTAs) worldwide based on revenue in 2024. Expedia Group, which operates brands like Expedia, Hotels.com, and Vrbo, reported the second-highest revenue that year. How big is the global travel and tourism market? According to Statista Market Insights, the travel and tourism market’s revenue worldwide – including hotels, package holidays, vacation rentals, camping, and cruises – amounted to over 900 billion U.S. dollars in 2024. Breaking down global travel and tourism revenue by sales channels highlights the leading role played by the online market, with online transactions generating over two-thirds of the total sales value.