@Cycloptichorn,
Cycloptichorn wrote: I'm having a hard time finding one-way tickets using the typical online sites, that would allow me to fly into one city and out of Europe from another, that aren't way more expensive than round-trip ones.
One possibilty is, searching for different budget airline-tickets.
Since they (usually) don't offer round-trip tickets, there will be no difference. (Okay, there certainly is a difference when calculating the price for a return-ticket).
Otherwise, just stick to one airline respectively to the same group (like OneWorld, Star-alliance ...)On my various tours through the USA I didn't notice a difference at all, when I left out a certain part - but I'm not sure, if it works here in Europe as well.
When buying airline tickets, compare the different websites in various countries, e.g. expedia USA vs expedia UK vs expedia (any EURO-country): usually, the European sites have cheaper tickets ...