Fly from either Washington DC-IAD or Baltimore to Copenhagen, Denmark for $310 roundtrip on Icelandair this fall.
Fares at this price are available from mid-October through mid-December and are mostly available for midweek departures. These tickets book into Icelandair's Economy Light fare class meaning only a carry-on up to 22 pounds is included. If you'd like to pack some more, you can buy Economy Standard for $100 more which will include a checked bag up to 50 pounds. Both fare classes allow you to stopover in Reykjavik (KEF) on either leg of your trip, Economy Light for up to 3-days, while Economy Standard tickets are allowed up to 7-days.
Searching on the Icelandair website, I found seats departing IAD on Monday, October 8 and returning from CPH on Thursday, October 18, 2018. There are many other dates available throughout the fall.
Need a hotel in Copenhagen? We've got you covered with these hotels from Hotelwatchdog on the mentioned dates above.