The best price I found requires a 9-day stay, but
A) Hotel Prices aren’t all that great and you’re probably better off clicking the links to check the alternate lodging options.
B)This is part of the overall Europe sale, and there are plenty of alternate dates available. (Just click on the price link to find dates that work for you.)
Denver to Luxembourg, Luxembourg plus 9 nights – Mon, Oct 30 to Wed, Nov 08.
Flight Alone: $380 (Check Business Class Fares)
Flight + basic hotel: $820 – Flight plus 4 & 5 star hotels: Click for more details
Not sure if this is the best airfare possible? (Compare historical fares)
Other options: AirBnB or VRBO. Hostels.com or Hostel World.
Know someone in Luxembourg? Try a reverse-search & invite them for a visit.
All Inclusive Options (if any)
Click here for screenshot of fare found