Booking Holdings runs the world's largest online travel marketplace. When someone books a hotel room, rental car, or flight through Booking.com, Priceline, Agoda, KAYAK, or OpenTable, the company earns a commission on that transaction. No travel happens inside Booking Holdings itself. The company just sits in the middle, connecting travelers to hotels and airlines, and takes a cut every time a deal closes. Secondary income comes from advertising, restaurant software subscriptions through OpenTable, and fees from processing payments on behalf of travelers. The diagram below traces where the money goes.
Five years of numbers tell a clear story. Revenue collapsed during the pandemic, then roared back faster than almost anyone expected. By 2025 the company reported $26.9 billion in total revenue, its highest ever. That is more than double the $11.0 billion it posted in 2021, the first full year of recovery. Free cash flow followed the same arc.
Cash generation is the most important health signal for a business like this. Booking Holdings does not build hotels or own planes. Its capital requirements are relatively low compared to its revenue. That means most of its operating cash can flow through to free cash flow. In 2025 the company produced $9.1 billion in free cash flow, up from $2.5 billion in 2021. That is a real measure of how much cash the business actually throws off after paying its bills.
One internal shift worth watching is the move from agency bookings to merchant bookings. In the agency model, the hotel collects payment from the traveler and pays Booking Holdings a commission later. In the merchant model, Booking Holdings collects the traveler's money first and then pays the hotel. Merchant bookings grew to 70% of total gross bookings in 2025, up from 63% in 2024. This shift brings in more revenue per transaction but also more costs, including payment processing fees, fraud chargebacks, and extra staff. Management says that in 2025 the extra revenue from facilitating payments exceeded the extra variable costs.
Total gross bookings hit $186.1 billion in 2025, a 12.4% increase over 2024. Room nights booked grew 8% to 1.235 billion. Flight tickets grew 36.6% year over year, though from a smaller base. The company is clearly growing. The question is whether that growth can hold its pace, and at what cost.
Marketing is the biggest single expense and it does not come cheap. In 2025 the company spent $8.2 billion on marketing, mostly to buy traffic from Google through paid search ads. That is 30.4% of total revenue, spent just to attract travelers to its own platforms. If Google raises the price of those clicks, or if fewer clicks turn into bookings, profitability shrinks fast. The company says direct bookings through its own apps and websites now account for a mid-fifties percentage of total room nights, which reduces its dependence on paid traffic. But that share still means roughly half of bookings still arrive through paid or affiliate channels.
The KAYAK write-down is not just an accounting entry. It is a warning about a specific threat the company names directly in its risk factors. Large technology companies including Google are building AI travel assistants into search engines and maps. If travelers start asking an AI chatbot to find and book a hotel instead of going to Booking.com or KAYAK, the number of people arriving at Booking Holdings platforms could fall. KAYAK, which earns money by comparing prices across travel sites, is the most exposed brand to this shift because its entire value is helping people search, and AI can do that too.
Regulation adds another layer of uncertainty. Booking.com has been designated a gatekeeper under the EU's Digital Markets Act and a Very Large Online Platform under the Digital Services Act. Smaller competitors face neither label. Separately, multiple governments are suing Booking.com for travel transaction taxes on past bookings, with potential liability including interest and penalties. In 2024, the company accrued $337 million to settle Italian indirect tax matters alone. These are not theoretical risks. Money has already left the business to cover them.
The Connected Trip is the company's answer to all of these threats. The idea is to keep the traveler inside Booking Holdings platforms from the moment they start thinking about a trip all the way through check-in and beyond, using AI tools, loyalty programs, and payment services to make it inconvenient to go anywhere else. Attraction ticket bookings grew about 80% in 2025, and flight ticket growth hit 37% year over year. These are encouraging numbers, but both are growing off a small base, and neither is yet close to the scale of the core hotel business. The Connected Trip remains a vision under construction, not a proven revenue engine.