Fee to withdraw where there is LN ⚡ support:

• Kraken: on-chain: 0.00001 BTC ($0.21), LN ⚡ withdrawal is free.
• OKCoin: on-chain: 0.00004 BTC ($0.85), LN ⚡ withdrawal is free.
• SouthXchange: on-chain: 0.00015 BTC ($3.18), LN ⚡ withdrawal is free.
• OKEx: on-chain: 0.0002 BTC ($4.24), LN ⚡ withdrawal is free.
• Bitfinex: on-chain: 0.0004 BTC ($8.49), LN ⚡ withdrawal is free.

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Fee to withdraw where there is not the ability to withdraw from BTC balance via LN ⚡:

• Coinbase: 0.00001731 BTC ($0.37)
• Binance US: 0.0004 BTC ($4.24)
• Binance: 0.0005 BTC ($10.61)
• BTSE: 0.0005 BTC ($10.61)
• BW: 0.0005 BTC ($10.61)
• KuCoin: 0.0005 BTC ($10.61)
• Poloniex: 0.0005 BTC ($10.61)

There are bunch more smaller exchanges that I didn't list for the "not able to withdraw via LN", mostly in the $10 range too.

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Exceptions:

• Flyp.me: on-chain: 0.00004 BTC ($0.85) <-- Swaps to BTC can be either on-chain or LN.
• BitSTAMP: on-chain: 0.0005 BTC ($10.61) <-- LN wIthdraw is through ZBD wallet only