Booking Holdings (BKNG) shares have declined 17.2% over the past year, trading at a P/E multiple of 17.3x, which is significantly below its historical average of 28.3x over the last twelve fiscal quarters. Analysts suggest that for the stock to appreciate substantially, the primary driver must be increased revenue from selling more travel services, such as room nights and flight tickets, rather than relying on multiple expansion alone. A Trefis three-year scenario models a potential 49% stock appreciation if annual revenue growth reaches 11.6%, driven by higher volume of bookings. This projection assumes the P/E multiple expands to 19.4x while net margins remain at 24.4%. The model indicates that revenue growth accounts for over 80% of the potential upside, highlighting the company's dependence on volume expansion to justify its valuation. Recent performance data shows a slowdown in growth momentum, with room nights increasing only 5% and revenue rising 8% in fiscal Q2 2026. Management has issued cautious guidance for fiscal Q3 2026, forecasting revenue growth between 4% and 6%, citing ongoing geopolitical tensions in the Middle East that are weighing on long-haul travel demand. Despite recent headwinds, Booking Holdings continues to strengthen its customer base, with high-tier Genius members now representing over 30% of active customers. The company is also seeing trips combining multiple bookings grow at more than twice the rate of total transactions, suggesting a shift toward higher-value multi-product itineraries on its platforms.