The firm has kicked off a transatlantic price war by announcing the wallet-friendly one-way fares, which will compete directly with Icelandic firm Wow air's sub-£100 flights to the USA.
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Announcing the news on Thursday, the Scandinavian firm confirmed 10 new routes and 38 weekly transatlantic flights from Edinburgh, Belfast, Cork, Shannon and Dublin to New York, Boston and New England.
The flights will serve three destinations on the US east coast, with a focus on smaller American airports – as they carry significantly lower landing charges. Norwegian says this has allowed it to drop fares to such a low rate.
The new transatlantic routes will be operated on brand new Boeing 737 MAX aircraft - a new state-of-the-art new aircraft which it says offers a greater seat capacity than existing single-aisle aircraft and free on-board Wi-Fi.
Flights are now on sale at www.norwegian.com/uk - however the routes will commence in June 2017. It is likely that peak time fares will cost slightly more as airlines tend to hike up prices with demand.
Twice-daily transatlantic flights from Edinburgh from £69. From 15 June 2017, Norwegian will launch new direct services from Edinburgh to three US airports - Stewart International Airport, Providence Airport, and Bradley International Airport - all offering simple and affordable connections to New York, Boston and New England. Fares start from £69 one way.
Transatlantic flights from Belfast, with fares from £69. From 1 July 2017, Norwegian will launch direct services from Belfast International to two US airports - Stewart International Airport and Providence Airport - offering connections to New York City, New England and Boston. Fares on Belfast's only direct transatlantic flights start from £69 one way.
Transatlantic flights from Cork, and new US routes from Dublin and Shannon, with fares from €69. From 1 July, Norwegian will the first ever transatlantic flights from Cork with a service to Providence Airport, together with new US routes from Shannon and Dublin to Stewart International Airport and Providence. Fares start from €69 one way.
The airline's boss Bjorn Kjos said: "We are pleased to announce our new highly-anticipated transatlantic routes. Our new, non-stop service will enable tens of thousands of new travellers to fly between the continents much more affordably.
"Norwegian's latest transatlantic offering is not only great news for the travelling public, but also for the local US, Irish and UK economies as we will bring more tourists that will increase spending, supporting thousands of local jobs."
Norwegian already operates two flights a day from Gatwick to New York starting at £125 each way for a ticket.
But while the seats are cheap passengers will be charged extra for things like checked luggage, a meal on board or a seat reservation.
Last year, Norwegian vowed to increase the number of flights from London to the US by 55% in 2017 to keep up with "huge" demand from customers.