Norwegian is celebrating its 15th birthday with promotional fares on its transatlantic and European services from the UK and Ireland.

The sale runs for three weeks until September 18, for travel between October 16, 2017 and March 16, 2018 (excluding weekends and school / public holidays).

Discounted fares include from £129 one-way between Gatwick and nine US routes (Boston, New York, Fort Lauderdale, Oakland/San Francisco, Orlando, Denver, Los Angeles, Seattle and Las Vegas) as well as Singapore.

From Belfast fares are available from £99 one-way to Stewart International, while from Edinburgh single tickets start from £135 to Stewart International, Providence, and Bradley International, and from Ireland fares are available from 99 one-way to Providence (from Shannon, Cork and Dublin) and Stewart International (from Shannon and Dublin).

Norwegian is also offering £29 single fares from Gatwick to nine European destinations including Malaga, Alicante, Barcelona, Madrid, Palma, Oslo, Stavanger, Copenhagen and Aalborg.

The low-cost carrier recently launched a second daily departure from Gatwick to New York, as well as new services to Chicago and Austin from March next year.