How Airline Credits and Vouchers Actually Work

Priya Raghunathan · March 14, 2026 · 8 min read

After a cancellation, the airline offers you 480 dollars in credit. That sounds like 480 dollars. Whether it is depends on four questions: who can use it, what it can be spent on, when it expires, and whether unused value survives the next booking.

Four instruments, often confused

The word used in the email is not reliable. Ask which of these you have been issued, because the answer changes what you can do with it.

Expiry is the value killer

Most credits expire twelve months from issue. A significant number expire twelve months from the original booking date, which can leave you with only a few months if the trip was booked far in advance. A minority require travel to be completed by the expiry date rather than merely booked, which is a much tighter condition.

• Book by expiry: you must make the reservation before the date, and travel can be later. The generous version.
• Travel by expiry: the flight itself must operate before the date. The restrictive version.
• Rolling expiry: a small number of carriers extend the credit when it is partially used.
• No expiry: rare, and worth noting when it happens. Southwest moved to non expiring flight credits, which is unusual in the industry.

Residual value

You hold a 480 dollar credit and book a 310 dollar ticket. What happens to the remaining 170 dollars?

1. Best case: a new credit is issued for the balance, carrying the original expiry or a fresh one.
2. Common case: the balance is retained but must be used in one further transaction.
3. Worst case: the balance is forfeited entirely, which is standard on some legacy voucher systems in Europe.

Where the worst case applies, the sensible move is to spend the credit on a ticket of equal or greater value and pay the difference in cash, rather than under spending it.

Transferability

Flight credits are usually locked to the original passenger name. Vouchers are more often transferable, and a few airlines allow the credit to be used for anyone as long as the original passenger is on the booking. Read the terms rather than assuming, because a family that pooled a cancelled trip into one credit can find only one person able to travel on it.

When you should refuse a voucher

There is a category of situation where cash is legally due and the airline offers a voucher instead. Accepting can extinguish the statutory claim. This applies to denied boarding compensation and to refunds after a cancellation in the European Union, the United Kingdom, Canada and the United States.

Airlines are permitted to offer the voucher, sometimes at a premium above the cash amount. You are permitted to decline, and the cash remains payable. If the premium is large and you fly that airline often, the voucher may still be the better commercial choice. Just make the decision knowingly.

Getting the most out of a credit you already hold

• Use it on a peak date. A credit is worth its face value regardless of when you fly, so applying it to an expensive week extracts more real value than applying it to a cheap one.
• Use it on a route where the airline is strong. You avoid paying a premium for their weak market position.
• Check whether it can pay for a premium cabin. Where it can, an upgrade often converts the credit into something you would never have bought with cash.
• Book early rather than at the expiry deadline. Availability at the last minute is exactly when fares are highest.
• If the airline changes the flight you booked with a credit, your normal passenger rights still apply. The credit does not weaken them.