WOW Air via ShermansTravel takes 30% off select WOW Air Roundtrip Flights to Europe from select cities in the U.S. via coupon code "WOWTREAT". (On the ShermansTravel landing page, click on "WowAir.US" in the main paragraph to see this sale.) That's the first such coupon we've seen from WOW Air. Save on flights to Copenhagen, Denmark; Dublin, Ireland; London, England; Reykjavik, Iceland; and more. Note that this airline is a "non-bundle" airline, so seat reservation and luggage costs are additional. Book this travel deal by November 2 for travel from November 1 through March 31, 2019.