Hoping to go to Toronto in Sept 2014. Currently looking at £500p.p. return flights with Aer Lingus or Norwegian. Personal circumstances MAY mean I need to change the booking and go at a later date (if I'm in a new job which won't honour the holiday). Airlines allow this for £85 per person per flight, plus the difference in cost between the original and replacement flight - my question therefore is; if I had to rearrange the date after booking, would I have any chance of getting £500 return flights at (for example) 2 months notice? I don't know if planes are like trains in that the earlier you book the cheaper. Anyone know of any good sales coming up?