Is Binance.com the most direct / only way? Binance.US doesn't seem to allow withdraw of BNB to Binance Smart Chain (BSC / BEP20).
I don't know the reason but you can't withdraw BNB with BSC on binance.US platform. Though there's a way to do it.
Check this reddit thread/reply
No. The fastest way for me has been to withdraw it via BEP-2 to the Binance Wallet and then transfer it to the BSC from there.
Seems there's no fee or low fee when transfering bnb from .IS to .COM platform.