Find, book and unlock your Zipcar all using the app. Book Roundtrip cars and vans up to a year in advance, perfect for longer trips. Or just reserve a one-way Flex car when you’re ready to go – we’ll hold the car for 15 minutes. When you’re ready to drive, use the app to navigate to the car and just tap the app to unlock it. You’ll also use the app to lock and end your booking.