Barcelona to Stuttgart Airport (STR) bus

FlixBus is one of Europe's leading low-cost bus companies, founded in Germany and offering long-distance bus services in Europe and the U. S. FlixBus also operates overnight buses on select routes throughout Europe. Standard amenities on FlixBus include free Wi-Fi, power outlets to charge your phone, tablet or laptop during long bus journeys, extra legroom, luggage space and toilets. You can even purchase snacks and drinks onboard. FlixBus offers only the Standard ticket for all its routes, which allows you to bring one carry-on luggage and one checked bag per person. Additional fees apply for extra luggage and specific seat reservations, such as if you want to book an Extra Seat, Table Seat or the Panorama Seat.

BlaBlaCar Bus (formerly known as Ouibus or iDBUS), a subsidiary of the popular French carpooling company, BlaBlaCar, is a bus company operating long-distance services in 10 countries in Europe. Founded in France, BlaBlaCar Bus provides connections to over 300 destinations. Standard amenities on the buses include air conditioning, toilets, USB and power outlets for charging phones, tablets and laptops during long bus journeys, extra legroom and adjustable seats. On select routes there is also free Wi-Fi available. BlaBlaCar Bus offers only the Standard ticket for all its routes, which allows you to bring one carry-on bag and up to two checked bags per person.