You can easily add travel insurance to an already booked flight by purchasing a standalone policy directly from independent insurance providers (such as Allianz, Allianz Travel, or specialized aggregators) online. When buying post-booking, you typically need to purchase the policy within a specific window (usually 14 to 21 days of your initial flight deposit) to qualify for pre-existing medical condition waivers and "Cancel for Any Reason" upgrade protections.
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