Originally Posted by
crnk
If you're ready to travel, then I'd suggest arriving 2-3 hours before there is a flight you'd like to take, and ask at the counter if they can make the change.
100%. BA quoted me a fare difference of approximately £4000 to change my ticket and fly back to the US last week instead of next month. So I went to the airport when I was ready to leave, asked if I could get on the next flight, and it was done. No extra charge.