I am planning on traveling from Boston to Edinburgh early this March and then on to Copenhagen some days later. If it is relevant anywhere, I am a US/NL dual citizen. This is my first travel to either of these locations, and indeed my first travel to a European destination outside of NL.
Firstly, for a travel plan of US->UK->DEN->US, how should I make use of my dual citizenship? Should I use my American passport or my Dutch one, or perhaps some combination of both?
Secondly, the way flights seem to be priced on online tools is a little complicated.I have been looking at flights from Airlines like WOW, Ryanair, and British Airways.
This got me to wondering, is there an airline that is best for BOS->EDI?
One way prices seem to be around USD$50 less than two way prices BOS<->EDI, which is crazy to me. Why would airlines price these flights similarly? Why do I find that it may be similarly expensive to fly two rount-trip flights in stead of a three-leg journey?
Edited for Clarity