You can change your seat on OnniBus double-decker routes before the trip. By logging in to the reservation management, you can change seats for free. You need the reservation number and email address to log in. If you have booked the ticket via R-Kioski you can change your seat only if you have told your email address to the cashier. Book your next trip What do you think about Onnibus? Give us Feedback Freshest news and travel tips What's New