Well if you are using UA miles the surcharges will be less than $400 for LH F with the usual T-15 restriction.
Just looked at my receipt from LH F last summer and it was $111 in total taxes (and I also flew OS J ex-US on that trip as well as SK and OS J intra-Europe so that $177 covers more than just the LH F portion).
Looks like FRA - ORD for tomorrow is $177. If you add beyond that in all likelihood you aren't getting surcharges but rather required taxes since most European airports charge high passenger charges for premium passengers (with LHR being the worst) - and those taxes can't be avoided no matter where you originate or who you book it with
Last edited by Duke787; Jun 29, 2015 at 1:01 am