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Do Delta miles expire?
No. Delta SkyMiles do not expire and there is no inactivity clock — Delta's own program rules state miles never expire. The catch is value rather than time: SkyMiles are priced dynamically against cash fares, so a balance held for years quietly buys less as fares and award prices rise.
GuideDo United miles expire?
No. United MileagePlus miles do not expire; United dropped its 18-month inactivity rule in August 2019 and has not reinstated it. A balance survives an idle account indefinitely. What it does not survive is devaluation — United prices awards dynamically, so miles held for years tend to buy less.
GuideDo Alaska miles expire?
No. Alaska dropped its 24-month inactivity rule in April 2023, and under the renamed Atmos Rewards program the terms state points have no expiration date and may remain in an account indefinitely. An idle Alaska balance is safe, so the only real risk to it is program devaluation.
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