WOW Air via ShermansTravel offers WOW Air Roundtrip Flights to Europe from select cities in the U.S., with prices starting from $199.98. (On the ShermansTravel landing page, click on "WowAir.us" in the main paragraph to see this sale.) That's the lowest price we could find for select routes by at least $285. This price is based on flights on January 12, 2019, from Boston, MA, (BOS) with arrival in Reykjavik, Iceland, (KEF) and return on January 16. Note that this airline is a "non-bundle" airline, so seat reservation and luggage costs are additional. Book this travel deal by December 31.