The sale prices are available for a limited time, the airline said, although the company hinted that similar offerings could be forthcoming.
"WOW air's goal is to enable everybody to fly by offering the lowest fares on the market," airline founder and CEO Skuli Mogensen said. "I am very proud that by offering $69.99 fares, we are enabling thousands of people to travel that otherwise could not afford it."
The announced fares are the latest salvo in an ongoing transatlantic fare war.
Norwegian Air Shuttle announced transatlantic flights last year for as little as half of what its competitors charged, Reuters reported. The move was possible because of low labor costs and exceptionally fuel-efficient planes, the airline said.