In 2021, Booking.com, one of the largest web portals for tourist facilities online reservations, started the Sustainable Travel Program. The main purpose behind it was to promote environmental consciousness among tourists as well as engage the tourist facilities owners to implement sustainable practices in their companies, and, as a consequence of such practices, reward them with a Sustainable Travel Badge. The objective of this research is to examine the engagement of Polish tourist facilities in low-emission and sustainable development activities. To meet the defined purpose, the research was conducted on the data about the facilities in Poland, included in the Booking.com Sustainable Travel Program. The study examines what types of facilities possess the sustainable badge more than others; in which voivodeships (provinces) of Poland there are more objects with the badge, and which Sustainable Travel Practices (out of 30) are realized more frequently. Such information may be useful when choosing a tourist destination, especially for tourists sensitive to environmental issues. The sustainable development practices introduced by Booking.com are mostly possible to be realized by large hotel enterprises. However, it is sometimes difficult to verify whether a certain practice is indeed implemented by a facility, or what exactly its implementation looks like in reality. The number of tourist objects engaged in the Booking.com Sustainable Travel Program has a low correlation with the level of wealth of the voivodeship where an object is located. It is justified by the fact that the wealthiest voivodeships in Poland are not necessarily the most attractive for tourists. The collected data can be a recommendation for both owners of tourist facilities and tourists regarding Polish regions and holiday destinations that meet the criteria of being sustainable, in accordance with the Booking.com guidelines.