Boston is a major hub for business and academics, and has plenty of cheap connecting options to New York City and Washington, D.C and the rest of the USA.
Sample fares include the following:
Oslo-Boston on September 24, return September 30 on Norwegian for 261 euros (the link in through their Spanish website).
Copenhagen-Boston on September 15, return September 27 on Norwegian for 281 euros (link is in Spanish).
London-Boston on September 15, return September 28 on Norwegian for 356 euros. This one is slightly tricky: You have to book the first leg to Copenhagen, then onwards to Boston. The return is a direct flight, which you can purchase here.
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