Who knows whether we'll be able to travel anywhere by then! However, Charleygirl says it for me. What she says chimes with my experience. I'm four months out from my hip replacement and it's gone very well indeed. I did no 'exercises' whatsoever but just walked. That's what I was advised to do and it's worked like magic. I'd have hesitated to fly after only two months but maybe you could get 'airport assistance'? Not sure if that's still available but worth checking out. Also maybe pay more for an extra legroom seat and take your own cushion to raise the height a bit.
Is it worth it for only a week though? You'll be fighting fit a few months later. Defer and go for longer?