Expiration mileage means the total number of miles up to which coverage is afforded under this policy. When the vehicle's mileage as recorded on the vehicle's odometer reaches the specified expiration mileage, coverage ends unless the expiration date has been reached prior to the expiration mileage having been reached.

Expiration miles refers to the policy within frequent flyer programs where earned points or miles are forfeited if the account remains inactive for a specific period. "Activity" is usually defined as either earning miles (through flying, credit card spend, or partners) or redeeming miles. The length of this window varies by airline; for example, some programs have an 18-to-24-month expiration policy, while others, like Delta SkyMiles, United MileagePlus, and Southwest Rapid Rewards, have moved to a "miles never expire" model in recent years. If your miles are set to expire, it means you must generate some form of activity to "reset the clock." If the miles actually reach their expiration date, they vanish from your account balance and lose all monetary and travel value. In 2026, many airlines offer a "reinstatement" service where you can pay a fee to get expired miles back, but this is usually a poor value. To avoid this, many savvy travelers use "dining programs" or small purchases through the airline's shopping portal to keep their accounts active without having to book a flight.