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United is offering MileagePlus members the opportunity to purchase miles at a discount — but the exact discount you’ll get is a mystery.

To see your United mystery miles offer, head to the promotion’s landing page, click the Reveal My Offer button and sign in to your account. You’ll then be directed to your personalized offer. Note that for all members, regardless of specific offer, the mystery miles promotion ends on May 24, 2018, at 11:59pm CT.

TPG staffers have reported getting offers ranging from a 100% bonus to a 60% bonus, including a 75% offer. Of course, some are better than others. For example, I was targeted to get up to 60% bonus miles with this promotion, broken down into the following tiers:

  • Buy 5,000-14,000 miles, get 35% bonus
  • Buy 15,000-29,000 miles, get 40% bonus
  • Buy 30,000-93,000 miles, get 60% bonus

If I were to maximize the promotion and purchase 93,000 miles, I’d pay $3,499, including taxes and fees, for a total of 148,800 miles. That comes out to about 2.35 cents apiece. Based on TPG’s most recent valuations, United miles are worth 1.4 cents apiece.

However, if you were targeted for the 100% bonus, it could make more sense. If you were to max out that offer and purchase 75,000 miles (and get a 75,000-mile bonus) for $2,821 including taxes, you’d be getting a favorable value of 1.88 cents apiece — the best-ever offering from United when purchasing miles.

It’ll be worth checking this mystery miles promotion to see if you were targeted for an enticing offer. Of course, if you’re close to a redemption or have something specific in mind, it could make sense to take advantage. Keep in mind also that the usual restrictions for purchasing United miles apply to this promotion, including the following:

  • You must purchase at least 2,000 miles. Miles may be purchased in increments of 1,000 miles.
  • Members can only purchase 150,000 miles per account per calendar year, and bonus miles count toward the 150,000 mile annual limit.
  • Miles may take up to 48 hours to post to your account.
  • Purchased or gifted miles do not count toward MileagePlus Premier status.

Note that the purchase is processed by, so you won’t get any travel category bonuses from this purchase. Make sure to use the best non-bonus category credit card for your situation. Based on TPG’s valuations, the Blue Business Plus Credit Card from American Express’s 2x Membership Rewards or Chase Freedom Unlimited’s 1.5x Ultimate Rewards points would be the most rewarding choice.

The Platinum Card® from American Express

The American Express Platinum card has some of the best perks out there: cardholders enjoy the best domestic lounge access (Delta SkyClubs, Centurion Lounges, and Priority Pass), a $200 annual airline fee credit as well as up to $200 in Uber credits, and mid-tier elite status at SPG, Marriott, and Hilton. Combined with the 60,000 point welcome offer -- worth $1,140 based on TPG's valuations -- this card is a no-brainer for frequent travelers. Here are 5 reasons you should consider this card, as well as how you can figure out if the $550 annual fee makes sense for you.

Apply Now
More Things to Know
  • Earn 60,000 Membership Rewards® points after you use your new Card to make $5,000 in purchases in your first 3 months.
  • Enjoy Uber VIP status and free rides in the U.S. up to $15 each month, plus a bonus $20 in December. That can be up to $200 in annual Uber savings.
  • 5X Membership Rewards® points on flights booked directly with airlines or with American Express Travel.
  • 5X Membership Rewards points on prepaid hotels booked on
  • Enjoy access to the Global Lounge Collection, the only credit card airport lounge access program that includes proprietary lounge locations around the world.
  • Receive complimentary benefits with an average total value of $550 with Fine Hotels & Resorts. Learn More.
  • $200 Airline Fee Credit, up to $200 per calendar year in baggage fees and more at one qualifying airline.
  • Get up to $100 in statement credits annually for purchases at Saks Fifth Avenue on your Platinum Card®. Enrollment required.
  • $550 annual fee.
  • Terms Apply.
  • See Rates & Fees
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