A traveler is able to buy a travel insurance policy the same day that the booking is made. As soon as the guest pays the initial deposit, it is wise to then begin shopping for a policy. There are advantages to purchasing travel insurance early, but the traveler is able to wait until 24 hours prior to departure. Once travel has begun, there is no longer an option for travel insurance. Always refer to the individual certificates of insurance for specific details. If a traveler wants medical coverage, but has already begun the trip, international medical insurance is a reasonable alternative. Those policies do not cover for cancellation or interruption, but they will provide medical coverage and can be purchased for any amount of time, at any time, regardless of travel dates. Contact Squaremouth with any questions or comments at 1-800-240-0369.