Suggestions requested!!!

I've been tracking prices of flights from various places (LAX, PHX, LAS,
etc) to Glasgow and the prices are still around $1400 for around the
dates of June 18th to June 27th. I am able to be flexible somewhat with
my dates, but I need/like to be there during the week of the 20th
(husband has a conference there).

Can anyone come up with suggested alternate routes? I've thought of
flying PHX to NYC, NYC to London, then London to Glasgow on a budget
airline or even drive to Glasgow from London. I've also looked at Boston
for an alternative and DC. Would their be any other point in Europe
that I might get a cheap flight to and then book another flight (next
day) to Glasgow?

I really would like to take this trip, but am not willing to shell out
$1400 - when I could spend a week in Hawaii for less than this amount
including hotel and car!!

TIA...much appreciated!