A mile balance can vanish with no event at all. Nothing goes wrong, time passes, and the balance is gone.
The three expiry models
- Activity-based expiry is the most common. Miles stay alive while the account sees qualifying activity within a rolling window. Earn or redeem anything and the whole balance’s clock resets. Go quiet for long enough and everything goes at once.
- Hard expiry retires miles a fixed period after they were earned, regardless of activity. Miles earned in a given month die in a given month. Activity does not save them, which surprises people who assumed a small transaction had protected everything.
- No expiry, sometimes conditional on holding a card, an elite tier, or an account that has not been dormant for a very long time.
Programmes change both the model and the window length, so the version you learned when you joined may not be the one running now.
Why the warning email does not arrive
Most programmes do send expiry warnings, to the address on the account. For a programme you joined years ago, that is often an old work address, a defunct provider, or a mailbox whose filters send airline mail somewhere you never look.
The fix takes two minutes per programme: log in, confirm the email address, and check that mail from that airline is not being filed away automatically. Do it for every programme holding a balance you would miss.
Keeping an account alive cheaply
Under an activity-based model, almost any qualifying transaction resets the clock, and it usually does not need to be a flight. Programmes typically count earning through a partner (a shopping portal, a dining programme, a card transaction, a hotel stay credited across) and redeeming for almost anything, including small items that cost a token number of miles.
The cheapest reliable method is one tiny partner earn or small redemption inside each window. Set a calendar reminder a couple of months before each programme’s deadline and do it then.
None of this saves miles under a hard-expiry model. There, the only options are to use them before the date or to lose them. Which model you are in decides whether the reminder is useful or merely reassuring.
Two ways out of a hard clock
Buy time. Some programmes sell it. Singapore Airlines publishes a price on its Service Fees page, checked 12 September 2026: 1,200 miles or USD 12 for every 10,000 miles or part thereof, buying six months for a KrisFlyer member and twelve for Elite Silver and Elite Gold. Expiring miles may only be extended once, so this buys one reprieve and not a rolling one. On a small balance the fee is a meaningful fraction of what you are extending, so do that arithmetic before paying.
Spend them. A balance too small for an award seat still looks unspendable, but it usually is not. Several programmes have non-flight redemption channels, and Singapore Airlines runs its own: spend a small balance on something that is not a flight through Pelago, its experiences platform, which by its own description lets you redeem miles against a booking. That does not keep the account alive. It turns miles on a deadline into something you get before the deadline passes.
Family pooling, where it exists
Several programmes let household members combine balances. That can turn three balances too small to use into one redeemable balance, and it can keep otherwise dormant accounts active. Rules on who counts as family and how often you may pool vary a lot, and some charge for the transfer. Where it exists, it is often the neatest fix for a nearly expired balance too small to spend.
What we actually do
Keep a short list: programme, expiry model, window length, and the date the clock next runs out. Review it twice a year. For any balance worth keeping, do a small qualifying transaction rather than trusting that some flight will happen in time.
Two habits go with that:
- Do not let miles accumulate for a trip you have not planned. A balance is worth most when spent, and every year you hold it adds devaluation risk. Where the trip is not coming and the clock is, a platform that takes miles as payment on every booking will clear a small balance faster than waiting for a route to make sense.
- Write down the model. The most common way this goes wrong is assuming activity protects a balance that was on a hard clock all along.
Spend a small balance on something that is not a flight (affiliate link)