American Airlines have roundtrip airfares from Denver CO (DEN) to Frankfurt Germany (FRA) for $528 including taxes/fees. This makes 1 stop.
Departs DEN: wide and great availability from Jan 10 thru Feb 28; March 4, 5, 6, 12, 13, 19, 20.
Returns: wide and great availability, generally with 7-day minimum stay.
Book it on Expedia [expedia.com]
, Orbitz [orbitz.com]
, Priceline [priceline.com]
or American Airlines [aa.com]
. Bundling hotel with your airfare will save money.
link to recent travel deals