Iberia and American Airlines has flights from Dallas (DFW) to Zagreb (ZAG) for $441-$466. Flights January to March. 7-day minimum stay required. Flight may operate as a Oneworld code-share.
Note: This is a slight price drop from Lufthansa’s sale from a few days ago.
Note: Fare allows for a free carry-on bag, but checked bags will cost about +$60 each-way.