Look at this, for example:
https://blockchain.info/tx/abc23f94572a7287a5f0acaab2e7e4bbef803e17b24508b2e780266d842a5521

Where it says Included In Blocks    482378 ( 2017-08-28 18:09:20 + 0 minutes )

+0 minutes, means, blockchain.info did not see the transaction until in confirmed.