United is offering a 75% bonus offer when purchasing their miles through January 23, 2017. This is a targeted offer so you’ll need to sign into your account to see what bonus offer you have received, although everyone will receive some offer. I personally was only offered a 50% bonus. It is also a tiered bonus, so based on your personal offer you’ll only receive the maximum bonus if you purchase 25,000 or more miles.
If you happened to receive the 75% bonus offer and go all and purchase the maximum number of miles (100,000) that will ultimately get you 175,000 miles and will cost $3,762.50 USD with taxes included. That means you are purchasing miles at 2.15 cents per mile.
This is definitely not an offer where’d I’d speculatively purchase, especially since many folks were targeted for a 100% bonus offer back in late 2016. 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. 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.