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Via The Flight Deal, there are great deals to Lisbon, Munich, and Vienna from Cleveland, Denver, Houston, Newark, and San Francisco. They found flights as low as $403 round-trip!
On Google Flights I found from San Francisco to Lisbon for $423. Be sure to check connection times to see if it makes sense for you.
I also found flights in the $400 range from Newark to Munich in October. And I found non-stop flights just after Oktoberfest (Oktoberfest 2016 ends October 2) for $577. That’s still a good deal!
Most of the fares are for travel between September to early December, 2016, and January to April 2017.
Let me know if you book a flight!