The card that works best depends on how you spend and which airline you fly
No single credit card earns the most miles for everyone. The best card for flight miles matches your actual spending pattern — whether you put most money toward groceries, gas, dining, or travel itself — and aligns with airlines you already use. A card that earns 5 miles per dollar on airfare is worthless if you never book directly with an airline. A card that earns 3 miles per dollar on dining only helps if you eat out regularly.
The real comparison is between two types of cards: those that earn miles with a specific airline (co-branded cards) and those that earn flexible points you can transfer to any airline partner. Co-branded cards usually offer higher earning rates on that airline's purchases and perks like free checked bags. Flexible-point cards earn at lower rates but let you move miles between multiple airlines, which matters if you fly different carriers or want to combine miles from multiple cards into one account.
Key Takeaways
- Co-branded airline cards earn the highest rates on that airline's tickets and purchases, but lock you into one carrier's earning and redemption rules.
- Flexible-point cards earn lower rates per category but let you transfer miles to dozens of airline partners, which is useful if you fly multiple carriers or want to pool miles.
- The card that earns the most miles is only valuable if you can actually redeem them at a reasonable cost in miles — check each airline's award chart before choosing.
- Annual fees on premium miles cards range from $95 to $550, so calculate whether the card's perks and earning rates will offset the fee based on your actual spending.
- Sign-up bonuses often deliver more miles in the first year than you'll earn from spending, so the bonus should factor heavily into your choice.
Co-Branded Airline Cards: Higher Earning, Single Airline
A co-branded card is issued by a credit card company in partnership with a specific airline — American Airlines, Delta, United, Southwest, and others each have multiple co-branded options. These cards earn the most miles per dollar when you spend with that airline: typically 3 to 5 miles per dollar on airline purchases, 2 miles per dollar on dining and gas, and 1 mile per dollar on everything else. The exact rates vary by card and issuer.
Co-branded cards also include perks that matter if you fly that airline regularly: a free checked bag on every flight, priority boarding, seat upgrades when available, and sometimes a free companion ticket after you spend a certain amount in a year. These perks have real value if you use them. A free checked bag saves $30 to $40 per round trip, and priority boarding can mean the difference between overhead bin space and gate-checking your carry-on.
The downside is that you're locked into one airline's award chart and redemption rules. If that airline devalues its miles — raising the cost to book a flight — your accumulated miles become less valuable overnight. You also can't combine miles from this card with miles from a different airline, so you're building one account rather than spreading earning across multiple carriers.
Flexible-Point Cards: Lower Earning, Multiple Airlines
Flexible-point cards earn points that you can transfer to airline partners rather than a single airline. The most common are American Express Membership Rewards, Chase Ultimate Rewards, and Citi ThankYou Points. These cards typically earn 1 to 3 points per dollar depending on the category, with higher rates on travel, dining, or specific merchants. You then transfer those points to an airline at a 1:1 ratio (or sometimes better during promotions).
The advantage is optionality. If you fly Delta one month and United the next, you can split your points between both airlines' programs. If one airline devalues its award chart, you can move future points to a partner that hasn't. You can also combine points from multiple flexible-point cards into one airline account, which means you can pool earning from a business card and a personal card, or from a card you've held for years and a new one you just opened.
The tradeoff is lower earning rates. A flexible-point card earning 2 points per dollar on dining generates fewer miles than a co-branded card earning 3 or 4 miles per dollar on the same purchase. Over time, this difference compounds. However, flexible-point cards often have lower annual fees or no annual fee at all, which can offset the lower earning rate.
How to Compare Cards by Your Actual Spending
To find the card that earns the most miles for you, start by tracking where your money actually goes. Most people spend the most on groceries, gas, dining, or subscriptions — not on airline tickets. A card that earns 5 miles per dollar on airfare is only useful if you book directly with the airline and spend thousands per year doing so.
Create a straightforward table of your monthly spending by category: groceries, gas, dining, travel, subscriptions, and everything else. Then look at the earning rates for cards you're considering in each category. Multiply your monthly spending in each category by the earning rate, add them up, and multiply by 12 to get your annual earning from spending alone. Then subtract the annual fee. This number tells you how many miles you'll earn per year from this card, not counting the sign-up bonus.
For example: if you spend $400 per month on groceries, $200 on gas, $300 on dining, and $100 on everything else, and a card earns 1 mile per dollar on groceries, 3 miles per dollar on gas, 3 miles per dollar on dining, and 1 mile per dollar on other, you'd earn (400 × 1) + (200 × 3) + (300 × 3) + (100 × 1) = 1,600 miles per month, or 19,200 miles per year. If the card costs $95 per year, you're netting 19,105 miles from spending alone.
Sign-Up Bonuses Often Matter More Than Earning Rates
A sign-up bonus — typically 50,000 to 100,000 miles for spending a certain amount in the first three months — often delivers more miles in year one than you'll earn from regular spending. A 75,000-mile bonus is worth more than three years of earning 25,000 miles per year from purchases. This means the sign-up bonus should weigh heavily in your decision, especially if you're choosing between two cards with similar earning rates.
However, the bonus only counts if you can meet the spending requirement without changing your behavior. If a card requires $5,000 in spending in three months and you normally spend $3,000 per month, you'll hit it naturally. If you normally spend $1,500 per month, you'd have to manufacture $2,000 in spending, which defeats the purpose. Manufactured spending — paying bills early, buying gift cards, or making purchases you don't need — erodes the value of the bonus.
Also check whether the bonus is worth the annual fee. A card with a $95 annual fee and a 50,000-mile bonus is only ahead if you value those 50,000 miles at more than $95. Most people value airline miles at 0.5 to 1.5 cents per mile, so 50,000 miles is worth $250 to $750. The bonus easily covers the fee. But if a card has a $550 annual fee and a 100,000-mile bonus, you need to value those miles at more than 0.55 cents each, which is below the typical range.
Redemption Value: Check the Award Chart Before You Choose
The miles you earn are only valuable if you can redeem them for flights at a reasonable cost. Before opening a card, look at that airline's award chart — the published list of how many miles a flight costs. Award charts vary wildly. Some airlines charge 25,000 miles for a domestic round trip in economy; others charge 50,000 or more for the same route. Some allow you to book partner airlines at the same rate; others charge significantly more.
If you're considering a co-branded card, check whether that airline's award chart has devalued recently. If it has, the miles you earn will be worth less than they were a year ago. If you're considering a flexible-point card, compare the award charts of the airlines you actually fly. If one airline's chart is significantly cheaper, that's where you should transfer your points.
Also check whether the airline allows you to book partner airlines. Some airlines let you book flights on partner carriers at the same award rate; others charge a premium. If you fly multiple carriers, this matters. A flexible-point card that transfers to an airline with a broad partner network is more valuable than one that transfers to an airline with few partners.
Annual Fees and Perks: Calculate the True Cost
Premium miles cards charge annual fees ranging from $95 to $550. These fees are only worth paying if the card's perks offset them. A $95 annual fee is justified if the card includes a free checked bag worth $30 to $40 per trip, priority boarding, and earning rates that beat a no-fee card. A $550 annual fee requires more: typically a high-value annual airline credit, lounge access, or earning rates so high that the card pays for itself through spending alone.
Some cards offer a statement credit toward airline purchases or baggage fees, which directly offsets the annual fee. For example, a card with a $95 annual fee and a $100 airline credit nets you $5 in value before you earn a single mile. Others offer lounge access, which is valuable if you fly frequently enough to use it. Calculate whether the perks you'll actually use cover the annual fee, then add the earning potential on top.
Also check whether the card waives the annual fee in the first year. Many cards do, which means you can earn the sign-up bonus and decide whether to keep the card before paying the fee. If you don't plan to use the card after year one, you can close it before the fee hits.
Frequently Asked Questions
Should I get a co-branded card or a flexible-point card?
Get a co-branded card if you fly one airline regularly and want the highest earning rates and perks on that airline. Get a flexible-point card if you fly multiple airlines or want the option to move miles between carriers. Many people hold both: a co-branded card for their primary airline and a flexible-point card for everything else.
Can I combine miles from different cards into one airline account?
Yes, if both cards transfer to the same airline. If you have two flexible-point cards, you can transfer points from both into the same airline account. If you have two co-branded cards from different airlines, you cannot combine the miles. Some airlines also allow you to combine miles from cards issued by different credit card companies, as long as both are co-branded with that airline.
What happens if an airline devalues its miles?
If you hold a co-branded card with that airline, your accumulated miles become less valuable because flights cost more miles to book. You can't do anything about miles you've already earned, but you can stop earning with that card and switch to a different one. If you hold a flexible-point card, you can move future points to a different airline partner that hasn't devalued.
How many miles do I need to book a free flight?
It depends on the airline and the route. Domestic round trips typically cost 25,000 to 50,000 miles in economy; international flights cost 60,000 to 150,000 miles or more. Check the specific airline's award chart for the routes you fly. Premium cabin awards (business or first class) cost significantly more, often 100,000 miles or higher.
Is it worth getting a miles card if I don't fly much?
Only if the sign-up bonus is large enough to cover the annual fee and you can meet the spending requirement without changing your behavior. If you fly once per year and spend $2,000 per month on a credit card, a card with a $95 annual fee and a 50,000-mile bonus might still be worth it because the bonus covers the fee. If you fly once per year and spend $500 per month, the card probably isn't worth it.