United MileagePlus buy miles mystery bonus flash sale – Up to a 100% bonus being offered

United MileagePlus has come out with another mystery buy miles bonus promotion. This time it is in a flash sale format only lasting four days. The bonus will be revealed to you after you login and can be as high as 100%. Personally I received 85% while others are receiving up to that 100% bonus. If you get the 100% bonus then it can be worthwhile to buy miles in this sale.

Offer details:
Receive up to 100% bonus when you buy MileagePlus Miles. Buy miles here. Until Jul 16, 20

The 85% bonus is broken down as follows:

  • Buy 5,000 to 14,000 miles receive a 20% bonus
  • Buy 15,000 to 34,000 miles receive a 50% bonus
  • Buy 35,000+ miles receive a 85% bonus
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