The best Expedia affiliate program depends on your niche and audience. Expedia offers several affiliate options, including the Expedia Partner Solutions program and the Expedia Affiliate Network. These programs provide access to a wide range of travel products, including flights, hotels, car rentals, and activities. The Expedia Partner Solutions program is ideal for larger websites or travel blogs, offering higher commission rates and more customization options. The Expedia Affiliate Network is better suited for smaller websites or those just starting in the travel affiliate space. Both programs offer competitive commissions, but the best one for you will depend on your goals.