Originally Posted by
Global321
FWIW - Several posters above have said they have changed their tickets to well into 2020, which, by definition, is well after 12 months from booking. This supports the theory that the last day to travel is 12 months from date of departure.
In fact if you try to do a Dummy booking in 2020 in 'A' class and look at the fare rules it will clearly state what date the return has to be before (and it is 12 months after the date you head out i.e in 2021)
I tried it for a 'A' class but it probably works for other fare classes too.