How can I modify my booking? On our website, you can modify or exchange your booking, up to 30 minutes before the departure of your bus, free of charge. Good to know: If the new ticket price is higher than yours, you'll have to pay the difference. Related articles Can I cancel my booking? What kind of modification can I do? How can I contact BlaBlaBus? How can I add a passenger to my booking? How do I book on blablabus.com?