The company 's website says the offer will be open for bookings for passengers till 19 June for travel dates from 4 January 2017 -- 21 August 2017 .
The offer starts today ( 13 June ) .
The company 's website says the offer , which starts today ( 13 June ) , will be open for bookings for passengers till 19 June for travel dates from 4 January 2017 -- 21 August 2017 .