Credit card miles are points you earn when you spend money on a card, and you can redeem them for flights, hotel stays, and other travel purchases.
Miles are a currency issued by airlines and credit card companies. When you use a card that earns miles, the card issuer credits your account with a certain number of miles for every dollar you spend. Most cards earn between 1 and 5 miles per dollar, depending on the card and the category of purchase. You accumulate these miles in an account tied to your name, and you can then use them to book travel through the airline's website or partner merchants.
The value of a mile varies widely. A single mile might be worth between 0.5 cents and 2 cents when you redeem it for a flight, depending on the airline, the route, and how you book. This means a card that earns 3 miles per dollar on dining might give you the equivalent of 1.5 to 6 cents back in travel value — far more than a cash-back card in the same category, or far less, depending on how you use the miles.
Key Takeaways
- Miles are earned at a set rate (usually 1 to 5 per dollar spent) and stored in an account you can access anytime.
- You redeem miles by booking through the airline's website or by calling their reservations line, not through the credit card company.
- The real value of a mile depends on the airline, the route, and whether you book during peak or off-peak travel times.
- Miles expire if your account is inactive for a set period, typically 12 to 24 months, so you need to use or maintain your account regularly.
- Some cards charge an annual fee to earn miles, so you should compare the fee against the miles you expect to earn and use.
How you earn miles on a credit card
Every purchase you make on a miles-earning card adds to your balance. The earning rate is fixed: a card might earn 2 miles per dollar on all purchases, or it might earn different rates in different categories — for example, 5 miles per dollar on flights and hotels, 3 miles per dollar on dining, and 1 mile per dollar on everything else.
Some cards offer a sign-up bonus: you earn a large lump of miles (often 50,000 to 100,000) if you spend a certain amount within the first few months of opening the card. This bonus is the main reason many people open a miles card — the bonus alone can cover a domestic flight or a portion of an international one.
Miles post to your account within a few days of the transaction clearing. You can check your balance anytime through the card issuer's website or app. Unlike some rewards programs, miles do not expire as long as your account remains active, though most airlines will close an inactive account after 12 to 24 months of no activity.
Where you redeem miles and what they cost
You redeem miles directly through the airline's website or by calling their reservations line. You log in with your frequent flyer account (which is separate from your credit card account), search for a flight, and choose to pay with miles instead of money. The airline then deducts the miles from your balance and issues you a ticket.
The number of miles required for a flight is not fixed. Airlines use a system called dynamic pricing, which means the mile cost of the same flight changes based on demand. A flight that costs 25,000 miles on a Tuesday in January might cost 50,000 miles on a Friday in July. Off-peak flights — early morning, late evening, or routes with less demand — typically cost fewer miles. Peak times and popular routes cost more.
Some airlines also let you redeem miles for hotel stays, car rentals, and other travel services through their website. The value you get varies by merchant and booking. You can also transfer miles to partner airlines or hotels, though the transfer rate is usually not 1-to-1 and you may lose value in the process.
The difference between miles and cash back
A miles card and a cash-back card both reward you for spending, but they work differently. A cash-back card gives you a percentage of your spending back as a statement credit or a deposit to your bank account — usually 1 to 5 percent. You can use that money for anything. A miles card gives you points that you can only use for travel (or transfer to travel partners), and the real value depends on when and where you travel.
If you travel frequently and book flights in advance during off-peak times, miles can be worth significantly more than cash back. A 5 miles-per-dollar card on airfare could give you the equivalent of 5 to 10 cents per dollar in travel value. But if you rarely travel or only book last-minute flights during peak season, you might get less value from miles than from a 2 percent cash-back card.
Some cards offer both miles and cash-back options, letting you choose how to redeem your balance. Others are miles-only. Read the card's terms to understand what you can do with your rewards.
Annual fees and whether they make sense
Many premium miles cards charge an annual fee, ranging from $95 to $550 or more. The card issuer justifies this by offering a higher earning rate, a large sign-up bonus, or perks like airport lounge access or statement credits for travel purchases.
To decide whether the fee is worth it, calculate how many miles you expect to earn in a year and what that is worth to you in travel. If you spend $50,000 a year on a card that earns 3 miles per dollar and charges a $95 fee, you earn 150,000 miles. If those miles are worth 1.5 cents each (a conservative estimate), that is $2,250 in travel value — far more than the fee. But if you spend $10,000 a year, you earn 30,000 miles, worth roughly $450, which still covers the fee but leaves less room for error.
Some cards also offer an annual travel credit — for example, $100 back on airfare purchases — which effectively reduces the fee. Factor that into your math as well.
How miles expire and how to keep your account active
Most airlines will not let your miles expire as long as your account has activity. Activity includes earning miles (by using a co-branded credit card), redeeming miles, or even just logging into your frequent flyer account. Some airlines count a flight as activity; others do not.
If your account goes inactive for 12 to 24 months (the period varies by airline), the airline may close your account and forfeit your miles. To prevent this, use your miles-earning credit card at least once every year or two, or log into your frequent flyer account to keep it active. Some airlines let you donate miles to charity, which also counts as activity.
If your account is closed, you may be able to reopen it and recover your miles, but this is not may provide. The safest approach is to use your miles or your card regularly enough to keep the account open.
Transfer partners and how they work
Some miles cards let you transfer your miles to partner airlines or hotel chains at a set rate. For example, you might transfer 1,000 miles to a partner airline for 1,000 miles in their program, or sometimes at a worse rate like 1,000 miles for 800 partner miles.
Transfers can be useful if you want to fly on a specific airline that is not your primary one, or if you want to combine miles from multiple cards into a single airline account to reach a higher redemption tier. But transfers usually cost you value, so only transfer if you have a specific flight or hotel in mind and the transfer gets you there more cheaply than redeeming directly.
Check your card's terms to see which partners are available and what the transfer rates are. Transfer rates can change, and some partners may be added or removed over time.
Frequently Asked Questions
Can I use miles from one airline on another airline's flights?
Not directly. Miles are airline-specific and can only be redeemed for that airline's flights (or partner airlines if the airline has a partnership). You can transfer miles to a partner airline if your card offers that option, but the transfer rate may not be 1-to-1 and you may lose value.
What happens to my miles if I close the credit card?
Closing the card does not automatically close your frequent flyer account or erase your miles. Your miles remain in your airline account as long as the account stays active. However, if you close the card and do not use your miles or log into your account for 12 to 24 months, the airline may close the account and forfeit the miles.
Do I have to pay taxes on the miles I earn?
The IRS generally does not tax miles earned through credit card spending or sign-up bonuses. However, if you receive miles as a prize or award, or if you transfer miles to someone else, tax rules may explore. Consult a tax professional if you are unsure about your specific situation.
Can I sell my miles to someone else?
Most airlines prohibit selling or transferring miles to another person. Your miles are tied to your frequent flyer account and can only be used by you. Some airlines allow you to gift miles to a family member or donate them to charity, but selling them violates the airline's terms of service.
How do I know if a miles card is better than a cash-back card for me?
Compare the earning rate and annual fee of the miles card against a cash-back card you would use instead. If you travel at least once or twice a year and book in advance, miles often provide more value. If you travel rarely or only book last-minute, cash back may be simpler and worth more.