What's the weight limit per bag on international flights?

It depends on the airline. Each one has its own policy. There are also carry-on limitations so check on those too. I made the mistake and I didn't check, so they confiscated all my stuff, valued about $200 total.

each and every airline would have a diverse weight for international flights. i recognize of two organizations, one helps 50 pounds, the different helps seventy 5 pounds. you go with to verify with the provider(s) you're flying to verify you aren't getting charged. some different person printed a message very last week in this classification about being bumped from a United Flight, rebooked on Lufthansa. United allowed 70, Lufthansa only allowed 50, they were given surcharged and requested people a thanks to get the money refunded.

Leaving the US, most airlines now limit the baggage to 2 checked bags, 23kg each for free. 1 carry-on piece, 12kg, and a purse or laptop.

Depends on the airline you're flying with, sometimes the distance (i.e. they allowed me to carry 60 kg. on business class when I flew from Australia to USA via Asia) and of course the class you're in, it can vary from 20-40 kg., e.g. 20 for coach, 30 for business and 40 for 1st class. Also if you are a member of respective frequent flyer club, they usually give you an extra 10 kg. once you've accumulated to certain milage.

Usually 30kg, but you'd better check with the airline, since every company has different restrictions

i think it's 30 kg or about 70 lbs.

Please check with your airline. They are all different.