Norwegian is offering cheap tickets from Norway (Oslo) to the Caribbean (Puerto Rico) and back from only 412 EUR.
From November till January 2016.
Oslo (OSL) – San Juan (SJU) – Oslo (OSL).
How to book:
Go to Norwegian.com and choose dates and routing from above.
Baggage during the trip:
Cabin baggage with maximum weight of 10 kg and maximum dimensions 55 x 40 x 23 cm.