What happens if my traveling companion cancels their trip due to illness and I still want to go but incurr additional costs as a result of their cancellation; Will travel insurance cover the additional costs? Published by Chris Harvey October 4, 2007 Most travel insurance plans will cover you for a single supplement upgrade when your traveling companion cancels or interrupts their trip due to a covered reason and you do not. Always refer to the policy certificate for full details. Related articles: What is the difference between trip cancellation and trip interruption? I have booked a trip with non-refundable tickets and now have to cancel. May I purchase insurance and file a claim? Will travel insurance protect me if I must cancel my trip due to the death or illness of a traveling companion’s family member? The quote form asks when I will leave home for my trip, but I only want to insure a portion of my trip. Can I simply select the dates I want to insure? I’ve booked my flights using miles, how does this affect my travel insurance?