[Butch Cassidy Slept Here]

Chrisal wrote...

I'm trying to come up with is the cheapest possible option to get her to Manchester on Christmas Eve

If I read your posts correctly Delta is now offering to refund your gf's ticket. At this point I would think the price of a new ticket would border on a "walk-up" fare (high cost.) If the latter is true, the only reason I can think of to stay with Delta would be frequent flyer miles (to me most frequent flyer programs are worthless piles of c**p.)

Air Canada is about as bad as some US-based carriers, but last time I checked they do fly EZE to Toronto (one-stop in Santiago) where your gf can connect onto MAN. Also, unlike the US, I don't believe Canada requires a transit visa. However, one should, obviously, check with the Canadian Embassy.