Posts about Travel deals
Atlanta to Copenhagen, 1 stop: $665
Atlanta to Vienna, 1 stop: $668
Atlanta to Budapest, 1 stop: $727
Atlanta to Stockholm, 1 stop: $645
Atlanta to Helsinki, 1 stop: $657
Atlanta to Gothenburg, 1 stop: $664
Atlanta to Billund, 1 stop: $656
Atlanta to Geneva, 1 stop: $669
Notes
If you are traveling to an EU country, you'll need to get the EU Digital COVID Certificate.
A covid test might be required for your return flight.
u/ATL30308 had a great point a while back: "Make sure to check entry/vaccination/testing/quarantine requirements very carefully before booking. A lot of these places are either not open to travelers from the US (and may or may not be in the near future) or have special requirements for foreigners."
We probably won't be seeing <$400 flights any time soon due to COVID.
The use Google Flights to find a date that works for you. Click the date to the right and let the calendar populate with the prices.
Some of the airlines are only showing prices for the shitty basic economy (Can't pick seat, etc), so expect the price to be a little more. Especially with Delta.
I would recommend buying from the airline's website instead of third party (priceline, expedia, etc).
Ideally, you want your layover to be in the same country as your point of origin. So your final destination is where you go through customs and not worry about missing a flight. If that isn't the case, try to find a flight with 2+ hour layover.
If you find a better deal, post the link.