Ways to upgrade Prem Economy Plus to Polaris
Have 5 x paid tickets on UA Premium Economy Plus (R fare), SFO - TLV non-stop, in June 2020. Have United co-branded card and a silver status.
Would like to end up flying in Polaris.
Website offers an upgrade to Polaris each way for 35,000 miles + $450 ... OR ... $1,500.
Looking for alternatives ... any alternatives that include miles with little or no cash, and preferably much less miles.