You can transfer SUI to Ethereum without paying high gas fees by avoiding direct Ethereum mainnet bridges and instead using cheaper intermediate routes. The most cost-efficient way is to bridge your SUI to a low-fee chain that supports both SUI and Ethereum bridges, such as Polygon, Arbitrum, or BNB Chain, and then move from there into Ethereum if you really need ERC-20 tokens. Another option is to use centralized exchanges like OKX, KuCoin, or Binance, where you deposit SUI, trade it for USDT/USDC, and then withdraw to Ethereum with much lower fees compared to on-chain bridges. If you do want a pure decentralized option, look for Wormhole or Celer bridges that offer SUI → Ethereum routes and check if they support batching or gas-sponsored transfers.

For programmatic transfers, you can build a transaction block that sends SUI to the bridge smart contract and specifies Ethereum as the target chain. The bridge handles locking or burning on Sui and minting on Ethereum. Here’s a simplified flow in TypeScript using the Sui SDK:

import { TransactionBlock } from '@mysten/sui.js/transactions';
import { SuiClient } from '@mysten/sui.js/client';

const client = new SuiClient({ url: "https://fullnode.mainnet.sui.io" });
const tx = new TransactionBlock();

// Example: lock SUI into bridge contract
tx.moveCall({
  target: "0xbridge::lock_sui",
  arguments: [
    tx.pure("1000000000"), // amount in MIST (1 SUI = 1e9 MIST)
    tx.pure("Ethereum"),   // destination chain
    tx.pure("0xRecipientEthereumAddress") // ETH recipient
  ],
});

const result = await client.signAndExecuteTransactionBlock({ transactionBlock: tx });
console.log(result);

Here's how to transfer SUI to Ethereum cheaply, without getting hit by high gas fees:

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Use the Official Sui Bridge (Most Efficient)

Sui Bridge provides direct bridging between Sui and Ethereum using a validator-backed mechanism.

When bridging Sui → Ethereum, you only pay Ethereum-side gas fees for the claim transaction. The Sui-side portion is often subsidized or very low cost.

Typical total cost: just the Ethereum gas—often around $10–$20 depending on network congestion (some users report similar costs).

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Alternative: Use Router Nitro Bridge

Router Nitro supports Sui and 30+ EVM chains with fast, low-cost transfers.

Users mention it's very affordable and efficient, plus you earn bonus SUI per transfer.

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Summary & Options

Method Cost Profile Notes

Sui Bridge → Ethereum Ethereum gas only Sui-side subsidized—most economical Router Nitro Bridge Low, plus bonus SUI Fast and cheap; community-trusted option

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Tips to Save More

Monitor Ethereum gas prices—bridging during off-peak hours can significantly reduce cost.

For stablecoins or other tokens, consider bridges like Wanchain CCTP (for USDC) or Portal (Wormhole)—some offer low fees.