United Airlines has Hamburg on sale for only $398.06 round trip for departures from Oct 15-29 and $482 for departures August 23 to October 14. Delta has low fares too at $526 to $530 round trip for many of these dates.
United Airlines Boston BOS – Newark EWR – Hamburg HAM – Newark EWR – Boston BOS
United Airlines Boston – Zurich ZRH (Swiss) – Hamburg HAM (Swiss) – Newark EWR (United) – Boston BOS
$495.56 round trip Tue Aug 23 – Sat Sep 3 (All UA itineraries are $485, Swiss/Lufthansa flights add $10-$20 to ticket price).
Delta Airlines/KLM Boston – Amsterdam AMS (DL) – Hamburg (KLM) – Amsterdam (KLM) – Boston (Delta)
Loyalty Traveler – Hotel Promotions Guide
Hotel loyalty program points and miles promotions for Best Western Rewards, Club Carlson, Choice Privileges, Hilton HHonors, Hyatt Gold Passport, IHG Rewards Club, Marriott Rewards, Ritz Carlton Rewards, Starwood Preferred Guest and Wyndham Rewards.