How to calculate the bitcoin tx fees? How were the transaction fees of 0.00011689 BTC calculated?
price_per_byte is the key that effect transaction cost for user. Generally standard fees for price_per_byte = 206 satoshi per byte which is too costly and higher for user, we can reduce it upto 2 satoshi. it will cost very low.

206 satoshi per byte transaction completes in very next block or in very next transaction means immediately. while 2 satoshi per kb transaction takes upto 2 to 3 hours to complete transaction.

general transaction space will be 224 to 299 kb if user send BTC to single user amount is not the matter here, so transaction cost will be very low based how much satoshi amount user has setup for transaction.