The Blockchain.info API might have block arrival times

[0xB10C]

https://www.blockchain.com/de/explorer/api/blockchain_api returns:

{
  "hash": "0000000000000bae09a7a393a8acded75aa67e46cb81f7acaa5ad94f9eacd103",
  "ver": 1,
  "prev_block": "00000000000007d0f98d9edca880a6c124e25095712df8952e0439ac7409738a",
  "mrkl_root": "935aa0ed2e29a4b81e0c995c39e06995ecce7ddbebb26ed32d550a72e8200bf5",
  "time": 1322131230,
  "bits": 437129626,
  "nonce": 2964215930,
  "n_tx": 22,
  "size": 9195,
  "block_index": 818044,
  "main_chain": true,
  "height": 154595,
  "received_time": 1322131301,
  "relayed_by": "108.60.208.156",
  "tx": [
    "--Array of Transactions--"
  ]
}

The received_time is interesting.