United Airlines has a new “Mystery Offer” promotion for up to 80% bonus on purchase of MileagePlus miles between November 2 – December 14, 2015 and it seems to be open for all.
You can purchase up to 150,000 MileagePlus miles in a calendar year including bonuses.
You can access this offer and see your bonus amount (sometimes there are better personalized offers) on United’s website here.
The price of purchasing 138,600 (bonus included) miles at 80% bonus is 2.1 cents each.
United has now offered me this 80% bonus several times in a row. Unless you need the miles NOW, I would either wait for 100% bonus or 50% discount that United has both offered over the past 12 months.
Here are the terms and conditions of this offer: