Well, I would just plan for 70k miles per person to get there and back in economy. That's a cool 560k points. Since starwood transfers at a rate of 1.25:1, you are 335k short. That's a lot of points but between you and a spouse/partner/another adult but it would be doable if you could meet a lot of minimum spends.

Those points are probably going need to be split into two different airlines. I wouldn't expect to get more than 4 tickets on the same itinerary. Even that would be tough. If you have enough adults, I would try to split it even more.

Figure 4x CitiAA cards (2 for each of you) at 40k = 160k
2x Chase United cards at 50k = 100k
2x Chase Ink or Sapphire (1 for each) cards at ~45-55k = ~100k

That gives 285k AA, enough for 4 tickets.
300k United miles, enough for 4 tickets as well.

Plan far enough ahead of time and with good enough credit and a ton of spending, you could do it. There's a lot of nuances that goes into applying and getting those various cards so you have your work ahead of you to do the research but it IS possible.