Originally Posted by
hectorb
A question about additional YQ charges when using Avios to upgrade from Premium Economy to Club World: I want to upgrade only the return leg of an LHR to USA round trip.
Is there any difference in the additional YQ fee if I do this as (a) a single round-trip booking (using Avios to upgrade the return leg only) or (b) as two separate single bookings (using Avios to upgrade only the second of these bookings)?
There will be a substantial difference in YQ if you book one ways, exUS YQ is pretty high. I absolutely would not recommend you do it that way.
In order to check the difference you can do it yourself, just price up a normal return cash fare for your flights on ba.com for WTP out and back and take a look at the breakdown of taxes/fees/charges. Then price up the same flights with WTP out and CW back, and again have a look at the taxes/fees/charges. The difference in the two TFC figures would be what you pay if you do your UuA.