Virgin Airlines are doing a massive sale with flights from Dublin, Shannon or Cork to loads of cities in the USA. These cities include New York, Boston, Miami, LA and San Francisco.
The cheapest round trip flights are €231 return and also include 23kg worth of luggage, unlike other carriers.
The sale is on until the lowest seats sell out which is usually quite quickly! The travel dates for this offer are between the 9th of January to the 22nd of March.
Below are sample fares with Skyscanner, click on these links to check alternative dates.

Please note prices are correct at time of publication and are subject to change.