What documents do I need to apply for a Canadian transit visa?

Because the transit visa is granted on the basis that you are only passing through, your supporting documents must make your connection clear. That usually means a valid passport and confirmed flight bookings showing your arrival in Canada and your onward departure to a third country.

You will also need to satisfy the visa officer that you meet the general requirements to transit — that you have ties that will take you onward, that your travel is genuine, and that you will not stay in Canada. Submitting clear, consistent itinerary documents is the most common way to avoid problems.