Contiki has designated a large number of trips as Definite Departures (DD). These Definite Departures are guaranteed to operate (except under circumstances beyond our control). Look for the green diamond-shaped symbol against individual departure dates on the itinerary of your choice. We are continually updating tours with Definite Departure status throughout the year – always check Contiki.com for the most up-to-date information. If you're booking a European Summer tour within 50 days of departure between 1 May-30 September, it’s automatically guaranteed that the tour will operate (except under circumstances beyond our control).