You can buy United miles directly from United, or earn them faster by opening a United credit card and meeting a spending requirement
United Airlines sells miles directly through its MileagePlus program, and you can purchase them outright at a published rate. However, the fastest and cheapest way to get a large balance of miles is usually to open a United-branded credit card, meet the minimum spending requirement in the first few months, and receive a sign-up bonus of 50,000 to 120,000 miles depending on the card. If you already hold a United card or don't want to open a new one, direct purchase is an option — but the per-mile cost is higher than what you'd pay through a card bonus.
Key Takeaways
- United credit card sign-up bonuses range from 50,000 to 120,000 miles and typically cost less per mile than buying miles outright from United.
- You must spend a set amount within a set timeframe (usually $3,000 to $5,000 in three months) to unlock the bonus miles.
- Direct purchase through MileagePlus costs roughly 1 to 1.5 cents per mile, making it the most expensive way to acquire miles unless you need them when ready.
- United also offers promotional mile-purchase offers during sales events, sometimes at a discount compared to the standard rate.
- Miles earned through credit card spending and bonuses count toward elite status qualification, while purchased miles do not.
United credit card sign-up bonuses versus direct purchase
A United credit card sign-up bonus is the most cost-effective way to buy miles in bulk. The United Explorer Card offers 50,000 miles after you spend $3,000 in the first three months. The United Club Infinite Card offers 120,000 miles after you spend $10,000 in the first three months. If you can meet the spending requirement through normal expenses, you're paying nothing per mile — the bonus is free.
Direct purchase through the MileagePlus website costs between 1 and 1.5 cents per mile depending on how many you buy at once. Buying 10,000 miles might cost $150 to $200; buying 100,000 miles might cost $1,000 to $1,500. This makes direct purchase the most expensive option unless you need miles urgently and cannot meet a credit card spending requirement.
How to meet a credit card spending requirement
The spending requirement is the dollar amount you must charge to the card within a set window — usually three months from account opening. This must be actual purchases; balance transfers, cash advances, and fees do not count. If you spend $3,000 on groceries, gas, and dining in three months anyway, you'll hit the requirement without changing your behavior.
If your normal spending won't cover it, you can accelerate the timeline by paying bills early, buying gift cards for stores you use regularly, or making a planned large purchase (car maintenance, home supplies, travel) on the card. Some people also use the card to pay a friend's share of a meal or bill, then receive cash back — though this is a gray area with card issuers and can violate terms of service if done repeatedly.
United's direct mile-purchase process
Log into your MileagePlus account on United's website and navigate to the "Buy Miles" section. You'll see the current price per mile and can choose how many to purchase in increments. United accepts credit cards, debit cards, and bank transfers. The miles post to your account within 24 hours.
United occasionally runs promotions where you can buy miles at a discount — for example, 20% off the standard rate during a sale event. These promotions are announced via email to MileagePlus members and on United's website. If you're planning to purchase miles directly, waiting for a sale can reduce the per-mile cost significantly.
Comparing the cost of each method
| Method | Miles Acquired | Cost | Cost Per Mile |
|---|---|---|---|
| United Explorer Card sign-up bonus | 50,000 | $0 (if you meet $3,000 spend requirement) | $0 |
| United Club Infinite Card sign-up bonus | 120,000 | $0 (if you meet $10,000 spend requirement) | $0 |
| Direct purchase (standard rate) | 10,000 | $150–$200 | 1.5–2 cents |
| Direct purchase (promotional rate) | 10,000 | $120–$160 | 1.2–1.6 cents |
Why miles earned through cards count toward elite status differently
Miles earned through credit card spending and sign-up bonuses count toward MileagePlus elite status qualification. Miles purchased directly from United do not. This matters if you're working toward Premier Silver, Premier Gold, or higher tiers, which unlock benefits like priority boarding, seat upgrades, and lounge access. A sign-up bonus of 50,000 miles moves you significantly closer to a status threshold; 50,000 purchased miles do not.
If elite status is your goal, opening a United card and meeting the spending requirement is a dual benefit: you get miles for redemption and miles that count toward status. Direct purchase only gives you miles to spend.
When direct purchase makes sense
Direct purchase is the right choice if you already hold a United card and don't want to open another, or if you need miles urgently and can't wait for a new card process and spending period. It's also an option if you've recently opened a United card and don't want to trigger credit inquiries by explore for another.
Some people also use direct purchase to "top up" a balance when they're close to the cost of a redemption. If you have 45,000 miles and need 50,000 for a specific flight, buying 5,000 miles directly may be faster than waiting for a new card bonus to post.
Frequently Asked Questions
Can I buy United miles as a gift for someone else?
You can purchase miles and deposit them into another person's MileagePlus account if you have their account number. However, you cannot open a credit card in someone else's name. If you want to give someone a United card bonus, you would need to add them as an authorized user on your own card, though the bonus miles go to your account, not theirs.
Do promotional mile-purchase offers happen regularly?
United runs mile-purchase promotions several times a year, usually during slower travel seasons or when the airline is promoting a new route. These sales are announced via email to MileagePlus members. If you're planning to buy miles directly, signing up for United's email list increases the chance you'll catch a discount offer.
What's the best United card if I want the biggest sign-up bonus?
The United Club Infinite Card offers the largest bonus at 120,000 miles, but it requires $10,000 in spending within three months and carries a $650 annual fee. The United Explorer Card offers 50,000 miles with a $3,000 spending requirement and a $0 first-year annual fee. The best choice depends on whether you can meet the higher spending threshold and whether the Club Infinite's benefits (lounge access, United Club passes) are worth the annual fee to you.
If I buy miles, can I use them right away?
Yes. Miles purchased directly from United post within 24 hours and are when ready available for booking. Miles from a credit card sign-up bonus post once the card issuer confirms you've met the spending requirement, which typically takes one to two billing cycles after you hit the threshold.
Are there taxes or fees when I buy United miles?
No. The price quoted on the MileagePlus website is the total cost. There are no hidden taxes or processing fees added at checkout. However, if you use a credit card to purchase miles, your card issuer may charge foreign transaction fees if you're outside the United States, though this is rare for purchases on United's U.S. website.