LOT, the national airline of Poland, has a deal where you fly from New York JFK to Amsterdam, with all-day layovers in Warsaw, Poland. $499 round-trip.
Warsaw is an interesting city, so this is a good deal with time to do some exploration.
Category: LOT
Chicago to Amsterdam This Fall for $514 Round-Trip
Late Summer, Fall and Winter, fly Chicago to Amsterdam for only $514 round-trip.
http://www.secretflying.com/2016/06/chicago-to-amsterdam-netherlands-for-only-514-roundtrip/
This deal is available from LOT Polish airline. Travel as soon as late August.
Chicago to Paris $493 Round-Trip on LOT
Valid through early March, on LOT (the Polish national airline).
http://www.airfarewatchdog.com/cheap-flights/Chicago-Illinois-ORD-to-Paris-Ile-de-France-CDG/
When you get to Paris, you can take any of the ultra-low-cost European airlines to other destinations including London, Madrid and Berlin.
