A 28-year-old Perth man has been sentenced to more than one and a half years jail for helping a drunk driver flee the scene of a fatal crash.

Sean James Smith gave a lift to his friend Ross Murray who had hit and killed cyclist Tim Anderson in Cottesloe last year.

Mr Anderson was training for a charity bike ride in March when he was hit by Murray's car.

Smith and Murray had spent the afternoon drinking together before the crash occurred, and he gave his friend a lift home after the crash.

Last year, Murray was sentenced to five years jail while today Smith was given 20 months.

He will have to serve half before he can be released.

Outside the court, Mr Anderson's father Ian said he did not believe justice had been done.

"The big problem for us is we've lost Tim and our sentence is a life sentence and nothing can ever equate to that," he said.

Mr Anderson says there was evidence at Smith's trial that he and Murray were drunk and speeding, swerving and trying to overtake each other just before the crash.

"I find it amazing that the only charge brought against Sean Smith was that of assisting his mate to leave the scene of the crime," he said.

"Surely it should have been manslaughter or at the very least he should have been charged with offences relating to drink driving and to speeding."