Fly from Ft Lauderdale to Copenhagen for $558 round-trip on Norwegian.
Searching Norwegian.com, we found seats departing FLL on Saturday, May 9, returning from CPH on Sunday, May 17. Flights connect via Stockholm on the outbound leg and are nonstop on the return.
You'll find similar fares available for travel on a handful of other dates in May.
This fare includes carry-on baggage only, weighing no more than 10kg/22lbs, so pack light or pay up. Should you prefer to check luggage, Norwegian's LowFare+ for these dates is $736 round-trip, which includes one checked bag weighing no more than 20kg/44lbs. Still not bad for May travel.
Need a room in Copenhagen? Here's a look at what's available on Hotelwatchdog for the above travel dates.
You'll also find rooms going for $113/night at the Copenhagen Admiral Hotel currently featured on Jetsetter.