A large share of denied travel insurance claims are not denials of coverage at all. The event was covered; the evidence required to prove it was never collected.
Claims are assessed on documents, not accounts
An adjuster works from a file rather than from a conversation, and every element of a claim has to be established by something written by a third party.
A traveller's own description of what happened supports the file but does not establish it, because the insurer has no way to verify it independently.
This is why two travellers with identical experiences can receive different outcomes. The difference is what each of them kept.
Some evidence exists only briefly
A written confirmation of a delay from an airline, a police report for a theft, or a medical note from the treating clinician are all far easier to obtain at the time than afterwards.
Many policies impose their own deadlines, requiring theft to be reported to police within a stated number of hours for the claim to be admissible at all.
Once the trip has ended and the traveller has flown home, obtaining a document from a foreign provider becomes slow, expensive, or simply impossible.
Proof of value is the second common gap
Lost or stolen property claims require evidence of ownership and value, which usually means original receipts or verifiable purchase records.
Without them, insurers apply depreciated estimates, and category limits for electronics, jewellery and single items cap the payout well below replacement cost.
Photographing receipts and serial numbers before departure solves this cheaply, and the images survive the loss of the items themselves.
Causation has to be documented too
It is not enough to show that a flight was missed. The file must show why, and that the reason falls within a covered peril rather than a general inconvenience.
Weather cancellations, mechanical delays and industrial action are frequently treated differently from one another, and the airline's stated reason determines which applies.
Requesting that reason in writing at the airport, rather than accepting a rebooking and moving on, is often the difference between a paid and a refused claim.
Building the file as the trip happens
A single folder holding the policy number, the emergency assistance line, receipts and any reports removes almost all of the friction later.
Contacting the insurer's assistance line during the event rather than after it also creates a record on their side, which supports the claim independently.
Deadlines for submitting the completed claim are stated in the wording and are usually short, so the file is most useful when assembled before returning home.