Scandinavian Airlines has round-trip flights from Chicago (ORD) to Amsterdam, Gdansk, Helsinki, Milan, Malaga, Oslo, or Copenhagen (AMS, GDN, HEL, MXP, AGP, OSL, CPH) for $390-$399 with a connection. Flights November to March. No Thanksgiving dates.
Malaga fares are only in November.
Some small OTAs on Skyscanner and Google have this for as low as $362; which is cheaper than the airline. If you plan on booking there, beware of any site that charges a fee to cancel a ticket within the 24-hour “free” period. Use unknown booking sites at your own risk.
Carry on bag with a maximum weight of 18 lbs is allowed for free on SAS. You can avoid seat selection fees by accepting the randomly assigned seat at the gate. Upgrading to a higher fare class that includes a full-size carry-on bag for about $35 may be cheaper than booking the discount fare with the added carry-on bag fee (for about $70).
Click for more details and booking links Cheap Flights: Chicago to Amsterdam, Gdansk, Helsinki, Milan, Malaga, Oslo, or Copenhagen $362-$399 r/t [November-March] (No Thanksgiving) – Scandinavian Airlines