For members aged 18 and older, miles are valid for the year in which you took the flight or used the service, plus the following two years. In a child’s account, miles do not expire until the child turns 18.
The validity period of miles can be extended. This will happen automatically if, during the final year of validity, you fly at least once with S7 Airlines or make at least one purchase with the S7 — T-Bank card that earns status miles during the calendar year, or with co-branded cards issued by S7 Airlines and other partner banks. You can also pay to extend the validity of miles: starting from 250 rubles for every 500 miles. The service is non-refundable. Otherwise, miles will be canceled when their validity period expires.