Buying United miles vs cash: the 3.5-cent break-even

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The verdict

1. United is the rare program that prints its price. As of September 2026 the MileagePlus buy-miles page states that miles cost $35.00 per 1,000 miles, plus taxes and fees, with a minimum purchase of 2,000 miles. That is 3.5 cents a mile before tax, so buying only wins when the specific award you are about to book returns more than 3.5 cents a mile. Check what your account is quoted first — you can see today's United miles price on Points.com before you commit anything.
2. Test one itinerary, not the idea. Price the exact flight both ways, subtract from the cash fare only the taxes and fees you would still pay on the award ticket, divide by the miles the award requires, and compare that number with the price per mile you were quoted. Run your own numbers: if the answer lands under 3.5 cents, the cash fare is the cheaper ticket and buying miles is a way of paying more for the same seat.
3. Buy to finish an award, never to stockpile. A purchase is a bet that a currency you do not control will be worth more later than the fixed price you paid today. The only version of this trade with a knowable answer is the top-up: you are short a few thousand miles, the award is priced and bookable in front of you, and the arithmetic in point 2 clears.

What United actually publishes about buying miles

Most loyalty programs make you sign in before they will show you a number. United does not. Its buy-and-transfer landing page carries two short disclaimers that do all the work: "Miles cost $35.00 USD per 1,000 miles"* and *"Plus, taxes and fees. Minimum purchase of 2,000 miles." We read both on the page's own served copy on 22 September 2026, using a browser user agent.

That is the entire published pricing disclosure, and it is worth being precise about what it does and does not cover. It gives you a list rate and a floor on your spend. It does not tell you the tax line, which depends on where you are billed, and it does not promise the rate you will see once you are signed in — the storefront shows the current price for your account, and promotional pricing appears there rather than on the marketing page.

The same page also publishes the cost of moving miles between members: mile transfers cost $7.50 per 500 miles, plus a processing fee of $30.00 per transaction. Those two lines turn out to matter more than they look, and we work through them below.

The 3.5-cent line, and why it is a floor rather than a price

Divide the published rate and you get the number the whole decision turns on: $35.00 ÷ 1,000 = 3.5 cents per mile. At the published minimum of 2,000 miles, that is $70.00 before taxes and fees.

Because the disclaimer says "plus, taxes and fees," 3.5 cents is the best case, not the all-in cost. Whatever tax is added at checkout pushes your real cost per mile above 3.5 cents, which means an award that returns exactly 3.5 cents a mile is a small loss, not a wash. Treat 3.5 cents as the line you have to clear comfortably, not squeak past.

This is also why a per-mile "valuation" you read somewhere is useless here. The only number that matters is the one from your own itinerary. A mile is worth exactly what the seat you want costs in cash, minus what the award still charges you, divided by the miles the award demands — and that number moves by route, by date, and by how full the flight is.

Transfers get cheaper than purchases above 1,500 miles

Run the same division on the transfer line: $7.50 ÷ 500 = 1.5 cents per mile, plus a flat $30.00 per transaction. A flat fee on top of a lower per-unit rate always produces a crossover, and here it is easy to find. Purchases cost 3.5 cents a mile; transfers cost 1.5 cents a mile plus a flat $30.00. Set the two equal and the fee is covered once $30.00 ÷ (3.5 cents − 1.5 cents) = 1,500 miles change hands. Below 1,500 miles, buying is cheaper. Above it, the transfer wins and keeps winning, because the fixed $30.00 spreads thinner with every mile while the purchase rate never moves off 3.5 cents.

Notice what that does to the published minimum. You cannot buy fewer than 2,000 miles, and 2,000 miles is already past the crossover: at list prices that purchase costs $70.00 before taxes and fees, while transferring the same 2,000 miles costs $30.00 of miles plus the $30.00 processing fee, or $60.00. In other words, on the published list rates there is no purchase quantity that beats a transfer — the smallest purchase United allows is bigger than the point where transfers take over.

There is one large caveat, and it is not a technicality: a transfer moves miles out of another member's balance rather than creating new ones. It only helps if somebody is willing to send them, and the miles they send are gone from their account. It is the right tool for a household that keeps two MileagePlus accounts and wants the balance in one place; it is not a cheaper way to manufacture miles from nothing. The purchase price is the only rate at which new miles enter the system.

The same page also offers a subscription (Miles by the Month), a Miles Multiplier that the page describes as letting members "multiply" miles earned in the previous month "by up to 10x," and a reinstatement option stating that "up to 750,000 expired miles can be reinstated" with pricing "starting from $50.00." We list those as what the page offers, not as rules — the reinstatement copy is a product description and we would not infer an expiration policy from it.

The break-even test, step by step

Do this in the booking flow with both tabs open rather than in your head.

Step one: get the cash number. Price the exact flight, on the exact dates, in the fare class you would actually accept. A refundable fare and a basic economy fare are not the same product, and comparing an award against the wrong one is how people talk themselves into a purchase.

Step two: get the award number. Price the same seat in miles and write down two figures — the miles required and the cash amount the award still charges. Awards are not free; what you save is the fare, not the taxes and carrier charges that ride along with it.

Step three: do the division. (Cash fare − the cash the award still charges) ÷ miles required = your value per mile. That is the only cents-per-mile figure in this exercise that means anything, because you computed it from two prices you actually saw.

Step four: compare with the quoted price, not the list price. If your itinerary returns comfortably more per mile than the storefront is charging you, buying the shortfall is rational. If it returns less, you are paying a premium to sit in the same seat. Our points value tool does this arithmetic with the United rate prefilled, and the same method is the spine of our guide to when buying hotel points is worth it.

Three cases where buying United miles actually wins

The short top-up. You are a couple of thousand miles short of an award that is priced and bookable in front of you, and the itinerary clears the break-even. Buying the minimum 2,000 miles at $70.00 before taxes to unlock a seat whose cash fare is far higher is not a valuation argument, it is arithmetic.

The seat that cash cannot buy well. Premium cabins are where per-mile returns get large, because the cash price rises faster than the award price does. If a long-haul business seat prices at a return well above 3.5 cents a mile, buying the gap can be the cheapest way into that cabin. Price it, do not assume it.

The last seat on a date you cannot move. When the trip is fixed — a wedding, a funeral, a work commitment — the alternative to buying miles is not a cheaper award later, it is today's walk-up fare. That comparison often clears easily.

And the case that never wins: buying because a sale is running. A discount off a price you were not going to pay is not a saving. It only becomes one after the itinerary-level test clears.

What we could not verify for this article

We hold ourselves to citing the program's own pages, so here is the gap list, plainly.

United's MileagePlus program rules page answered our requests with an automated bot challenge rather than the rules on 22 September 2026 — the response carried a challenge page, not the program document — so this article does not state United's expiration policy, its annual purchase caps, or whether purchased miles count toward Premier status. Those are exactly the rules you want before a large purchase, and they belong to United to state, not to us to infer from a marketing page.

For contrast, the two airline programs whose terms did open for us are explicit on the status question: Southwest's terms state that purchased, gifted, transferred and donated points "do not count toward A-List, A-List Preferred, or Companion Pass qualification," and Alaska's Atmos Rewards conditions state that "purchased, gifted, or transferred points are not eligible for earning status points." That is the industry pattern, and we discuss both in our looks at buying Southwest points and buying Alaska miles. It is not a statement about United, and you should read United's rules before assuming it applies there.

We also did not read a live United award price for this article, so there is no worked fare example here by design — the four-step test above is the substitute, and it is better than our example would have been because it uses your dates.

If the airline side is not where your balance lives, the same discipline applies to hotels: see our reads on buying Choice Privileges points, buying Hyatt points, and buying Marriott points, and — if you are choosing a chain rather than a currency — which chain gives business travelers the most predictable room. Once you have run the test and the answer clears, check the current per-1,000 price shown for your account and buy only the shortfall.

FAQ

How much does it cost to buy United miles?

United's buy-miles page states that miles cost $35.00 per 1,000, plus taxes and fees, with a minimum purchase of 2,000 miles, read on 22 September 2026. That works out to 3.5 cents a mile before tax. The price you are actually charged appears on the storefront once you are signed in, and promotional pricing shows up there rather than on the public page.

What is the minimum number of United miles you can buy?

The page states a minimum purchase of 2,000 miles as of September 2026. At the published rate that is $70.00 before taxes and fees. There is no published minimum on the transfer product on the same page, but every transfer carries a $30.00 processing fee, so small transfers are expensive per mile.

Is it cheaper to transfer United miles or to buy them?

On the published rates, a transfer costs $7.50 per 500 miles plus a $30.00 per-transaction fee, and a purchase costs $35.00 per 1,000 miles. The fixed fee is covered at 1,500 miles, so above that quantity the transfer is cheaper per mile. The catch is that a transfer moves miles from another member's balance instead of creating new ones, so it only helps when someone is willing to send them.

Do purchased United miles count toward Premier status?

United's own program rules page returned a bot challenge instead of the rules when we requested it, so we could not confirm either way and we are not going to state it. Two airline programs whose terms we could read, Southwest and Alaska, both exclude purchased points from status qualification, and that is the common pattern, but check United's own rules before you buy miles with status in mind.

Is buying miles ever cheaper than buying the ticket?

Sometimes, and only per itinerary. Divide the cash fare, minus the cash the award still charges, by the miles the award requires. If that number beats the price per mile you are quoted, buying the shortfall is cheaper than the ticket. If it does not, you are paying a premium for the same seat.