Travelers can purchase trip insurance up to the day before they depart.
This is actually a very common question. Many people think of the insurance process as being complicated and time consuming. Travel insurance, however, has become a very streamlined business thanks to the web.
Travelers looking for cruise, vacation, or tour coverage can do their research online and compare several different plans at once. You can get instant quotes, pay with a credit card, and recieve an email confirmation almost immediately.
There are benefits to purchasing your trip coverage early
To benefit from financial default coverage and pre-existing medical condition waivers, travelers should get their travel insurance as soon as they start planning and paying for the trip. An archived post, Reasons to buy travel insurance when you book you trip, discusses this further.
Quotetravelinsurance.com Trip insurance comparison site