United is offering a bonus of up to 100% miles when purchasing their miles for a limited time through September 12, 2017. This is a tiered offer and to get the full 100% bonus, you must purchase at least 50,000 miles.
If you go all in and purchase the maximum number of miles (75,000) that will ultimately get you 150,00 miles and will cost $2,821.88. That means you are purchasing miles at 1.88 cents per mile.
This is probably one of the better (if not best) purchase United points opportunities directly through United. I personally wouldn’t purchase miles speculatively at this rate, but if you have an upcoming flight you are looking to book it is definitely worth to see if purchasing miles is cheaper than paying the lowest available rate. Also, this could be a good way to top off the number of miles required for an award ticket.
Additionally, if you purchase miles under this promotion, you’ll be entered into a drawing to win bonus miles! Definitely not a reason to purchase the miles, but an extra little perk. You can purchase miles here.
Note: This transaction is from points.com so you will not receive bonus miles if using a credit card that gives a bonus for travel/airline purchases.