Skyscanner is pretty good still... albeit not as good as it used to be. Can get some bargains. Especially if dont have "set" dates before you look.
AND from the US? I would say that if you simply look for the cheapest flights to and from Europe (can be from different places, BUT often the cheapest are return tickets) that is the best way unless you have your heart set on a specific place.
As ~4 months out? You can probably get ~30 euro flights between most big cities in Europe.
For example even right now:
Boston or New York to Barcelona, Lisbon or Portugal? Somewhere around 320-350 dollars return.
Vergleiche Billigflüge von allen großen Fluglinien und Reisebüros und finde die billigsten Tickets zu all deinen Lieblingszielen. Jetzt online buchen.
www.skyscanner.net
Vergleiche Billigflüge von allen großen Fluglinien und Reisebüros und finde die billigsten Tickets zu all deinen Lieblingszielen. Jetzt online buchen.
www.skyscanner.net
And to Ireland, Denmark, France and Germany? Somewhere around the same.
UK is slightly more expensive (say 350-400) BUT the UK has so many airports and with Ryanair, Wizzair, Jet2 and Easyjet having so, so many flights from the UK? Can usually go anywhere you want under 50 dollars one way if book a few months in advance.