Miles are a currency your credit card issuer creates, and you earn them by spending money on the card
When you use a credit card that offers miles, the card issuer credits your account with a set number of miles for each dollar you spend. The earning rate varies by card — some cards give you one mile per dollar on all purchases, while others give you two or three miles per dollar on certain categories (like flights or restaurants) and one mile per dollar on everything else. A few cards offer bonus miles just for opening the account, though these usually come with a spending requirement you have to meet within a set timeframe.
Miles accumulate in an account tied to your card. You do not receive them as cash or as a statement credit — they sit in a separate balance that only the card issuer can see and manage. The issuer decides how many miles you have, what they are worth, and whether they expire. Most cards do not expire miles as long as your account stays open and active, but some do, so check your card's terms.
Key Takeaways
- You earn miles by charging purchases to your card at a rate set by the issuer — typically one to three miles per dollar depending on the card and the category of purchase.
- Miles are a proprietary currency controlled by the card issuer and can only be redeemed for rewards the issuer offers, not converted to cash or used elsewhere.
- Redemption options usually include airline tickets, hotel stays, car rentals, or statement credits, though the value per mile varies widely depending on what you book.
- Miles have no may provide value — the issuer can change redemption rates, devalue miles, or add restrictions at any time, even for miles you already earned.
- Annual fees, interest charges, and missed redemption opportunities can easily erase the value of miles you earn, so the math matters more than the number.
What you can actually redeem miles for
Most credit card miles can be redeemed through the issuer's travel portal, which is an online marketplace where you book flights, hotels, car rentals, and sometimes cruises or vacation packages. You log in, search for what you want, and pay the price in miles instead of dollars. The issuer sets the mile price for each option, and that price can change without notice.
Some cards also let you transfer miles to airline or hotel loyalty programs. If your card is issued by an airline (like a United or American Airlines card), you can usually move miles directly into that airline's frequent flyer account. This can sometimes get you better value than booking through the card's portal, because airline programs have their own pricing and sometimes offer deals the portal does not. However, transferring miles is usually permanent — you cannot move them back if you change your mind.
A third option on many cards is a statement credit. You redeem miles for a credit to your card bill, usually at a fixed rate like one cent per mile. This is the least valuable use of miles for most people, because a mile is typically worth more than one cent when you book travel through the portal or transfer to an airline program.
How the value of a mile actually works
A mile has no fixed dollar value. Its worth depends entirely on what you redeem it for. If you use 25,000 miles to book a flight that would have cost $300 in cash, each mile was worth 1.2 cents. If you use the same 25,000 miles to book a flight that would have cost $500, each mile was worth 2 cents. The same miles, the same card, completely different value.
This is why comparing cards by their earning rate alone is misleading. A card that earns three miles per dollar sounds better than one that earns one mile per dollar, but if the first card's miles are worth less when you redeem them, you might come out behind. You have to look at both what you earn and what the miles are worth in the redemptions you actually plan to make.
The issuer controls redemption pricing and can change it anytime. Airlines and hotels do the same thing with their own loyalty programs — they can devalue miles or add blackout dates without warning. This means miles you earned last year might be worth less this year, even though you did nothing different.
Annual fees and whether miles are worth the cost
Many miles cards charge an annual fee, ranging from $95 to $450 or more. The issuer usually justifies this by saying the card earns miles faster or offers premium benefits. Whether the fee makes sense depends on whether you actually use the card enough to earn miles worth more than the fee.
If a card costs $95 per year and earns two miles per dollar, you would need to spend roughly $4,750 per year just to break even — that is, to earn 9,500 miles that you could redeem for about $95 in travel value. If you spend less than that, the card costs you money. If you spend more, you might come out ahead, but only if you actually redeem the miles for travel and do not let them sit unused.
Some cards waive the annual fee for the first year, which gives you a window to test whether you will actually use the card. Others offer a statement credit or bonus miles each year that offset part or all of the fee. Read the terms carefully, because these benefits often have conditions — like a minimum spending requirement — that you have to meet to get them.
Interest charges and carrying a balance can erase miles value
If you carry a balance on a miles card and pay interest, the interest charges will almost always exceed the value of the miles you earn. Credit card interest rates typically range from 18 to 25 percent per year. If you spend $1,000 and carry that balance for a year, you will pay $180 to $250 in interest while earning maybe 1,000 to 3,000 miles — worth roughly $10 to $30 in travel value.
Miles cards only make financial sense if you pay off the full balance every month. If you cannot do that, a cash-back card that gives you a percentage back on every purchase is usually better, because you get the reward whether you pay interest or not. With miles, the reward only has value if you actually redeem it, and that value disappears if interest charges exceed what the miles are worth.
How bonus miles work and what the spending requirement means
Most new miles cards offer a bonus — typically 50,000 to 100,000 miles — if you spend a certain amount within a set timeframe, usually three to six months. This bonus is the main way card issuers attract new customers, and it can represent significant value if you were planning to spend that money anyway.
The catch is the spending requirement. If a card offers 75,000 bonus miles for spending $5,000 in the first three months, you have to actually charge $5,000 to the card during that window. Some cards count only new purchases, not balance transfers. Some exclude certain categories like cash advances or wire transfers. Read the terms to know exactly what counts.
If you cannot meet the spending requirement through normal purchases, do not artificially inflate your spending just to get the bonus. The interest and fees you pay on extra charges will cost more than the miles are worth. The bonus only makes sense if it is miles you would have earned anyway by spending money you were already going to spend.
Miles expiration and account closure
Most major credit card issuers do not expire miles as long as your account remains open and you use the card at least once per year. However, some issuers do have expiration policies, and the rules vary. A few cards expire miles after a set period of inactivity — typically two to three years without any account activity.
If you close the card, the issuer may close your miles account as well, and you could lose all your miles. Some issuers let you keep miles in a separate loyalty account even after you close the card, but you have to request this before closing. If you have a large balance of miles, contact the issuer before closing the card to understand what happens to them.
Check your card's terms or contact the issuer directly to confirm the expiration policy. Do not assume miles never expire — some cards do have rules about this, and losing miles to expiration is a permanent loss.
Frequently Asked Questions
Can I transfer miles to someone else or use them to buy a ticket for another person?
Most issuers do not let you transfer miles to another person's account. However, many do let you book travel for someone else using your miles — you just have to be the one making the reservation. Some cards also let you add an authorized user to your account, and that person can use miles from your account to book their own travel. Check your card's terms for the specific rules.
What happens to my miles if I miss a payment?
Missing a payment can damage your credit and may trigger penalties, but it usually does not immediately erase your miles. However, if your account is closed due to missed payments, the issuer may close your miles account as well. The best approach is to contact the issuer immediately if you miss a payment and ask about your options.
Can I sell my miles to someone else?
Most card issuers prohibit selling miles in their terms of service. Some third-party websites claim to buy and sell miles, but these transactions are risky and often violate the issuer's rules. If the issuer discovers you sold miles, they may close your account and cancel all your miles.
Do I have to use miles before they expire, or can I let them sit indefinitely?
Most major issuers do not expire miles as long as your account stays open and active, but some do have expiration policies after two to three years of inactivity. Check your card's terms or contact the issuer to confirm. If your card does have an expiration policy, you need to use or transfer your miles before the deadline or lose them.
Is it better to redeem miles for flights or to take a statement credit?
Redeeming for flights through the card's travel portal or transferring to an airline program usually gives you more value per mile than taking a statement credit. A statement credit typically pays one cent per mile, while flights often provide two to four cents per mile or more. However, the best redemption depends on the specific flights available and their pricing on the day you book.