Flights to the US from £99 one-way and £29 to Europe are being offered by Norwegian as the budget airline marks its 15th anniversary next month.
The special fares are available on 28 routes from the UK and Ireland for three weeks starting from today (Tuesday) until September 18.
Travel can be taken between October 16 and March 16 next year.
The promotion includes ten long-haul routes from Gatwick starting at £129 single, including Boston, New York, Fort Lauderdale, Oakland/San Francisco, Orlando, Denver, Los Angeles, Seattle, Las Vegas and Singapore.
Flights from Belfast to the US east coast start at £99 and £135 from Edinburgh.
Nine European destinations are available from Gatwick with a £29 lead-in – Malaga, Alicante, Barcelona, Madrid, Palma, Oslo, Stavanger, Copenhagen and Aalborg.
Norwegian Chief Commercial Officer Thomas Ramdahl said: “To help celebrate 15 years of affordable flights with Norwegian, we’re delighted to offer holidaymakers further savings on 28 routes from the UK and Ireland.
“With affordable fares to the US, Singapore and Europe, our birthday sale has something to offer all travellers.
“We’re very grateful for the loyal support our passengers have shown us over the last 15 years, and we look forward to welcoming them on board for many more years to come.”