Cabin Upgrade on Reward Seat Purchase

Hi one and all,

So I have just recently booked reward seat sale flights in Premium Economy (LHR-LAX) and Economy (LAS-LGW) using the majority of my miles. If I wanted to upgrade the return leg to Premium, when I have gained enough miles/availability, what additional costs would there be? Is it just the difference in taxes?

Many thanks in advance!

[Neil]

Yes, you'll need to pay the appropriate PE taxes, and also the difference in miles between the reward econ miles you paid and the full PE miles for that leg.

+ maybe any booking change fees

Perfect, thanks for the help!