Airline Credits Expire On The Original Ticket's Clock

A cancelled ticket that becomes a credit rather than a refund carries rules inherited from the original purchase. The most consequential of them is the date the clock started.

A credit is a residual value, not a balance

The value sits against the original ticket number rather than in an account. It is the unused portion of a document, held by the carrier that issued it.

That is why credits are often not transferable, cannot be combined freely, and sometimes cannot be split across two future bookings. The document, not the money, is the unit.

It is also why the credit is denominated in the currency of the original sale, and why using it for travel priced in another currency can produce a conversion the traveler did not choose.

The deadline usually runs from purchase

Validity is commonly measured from the date the original ticket was issued, not from the date the trip was cancelled or the date the credit was created.

A traveler who bought a ticket well in advance and cancelled shortly before departure may therefore find that a substantial part of the validity period was consumed before the credit existed.

Some issuers measure it differently, and the only reliable source is the credit record itself. The assumption to avoid is that the clock started when the plans changed.

Book-by and travel-by are different dates

Many credits require only that a new ticket be issued before the deadline, with travel permitted later. Others require the travel itself to be completed by the date.

The difference is large. A book-by rule lets a traveler preserve the value by making any qualifying reservation, while a travel-by rule forces an actual trip into a narrow window.

When the rule is unclear, treating it as travel-by is the conservative reading, because being wrong in that direction costs planning flexibility rather than the whole value.

Fare rules travel with the credit

Applying a credit does not reset the conditions of the new ticket, and it does not usually escape the change conditions attached to the fare being bought.

If the new fare is itself restricted, cancelling again can produce a second credit with the same or a shorter life, and value can erode across successive rebookings.

Residual value after a cheaper rebooking is another trap, because whether the leftover amount survives at all depends on the rules of the ticket it came from.

Why carriers prefer credits

A credit keeps the money inside the business and effectively guarantees a future sale, while a refund returns cash and ends the relationship for that transaction.

It also converts a liability with a certain cost into one with an expected cost, because some share of credits is never used. That breakage has real value to the issuer.

Understanding that asymmetry is the point: the credit is a better outcome for the airline than a refund, so the burden of tracking the deadline sits entirely with the traveler.