Police are appealing for witnesses after a 52-year-old man was attacked on the cycle track running by the A23 at Gatwick.
The man, who was walking to the airport to fly home to see his family, was assaulted between 8.15pm and 9.30pm last Saturday (July 19).
He suffered head and shoulder injuries from being struck with an object from behind, facial injuries from being punched and bruising from being kicked while on the ground.
A Sussex Police spokesman said a cyclist was seen to pass the victim just after the attack, travelling towards Gatwick's south terminal just before the cycle track passes under the terminal.
PC Steve Cranswick said: "This appears to be a random and unprovoked attack on an innocent man on his way home to see his family.”
He said: "I would urge anyone who has information, especially the cyclist who may have seen the attacker, to contact us as a matter of urgency."
Anyone with information should call 101, quoting serial 113 of 20/07, email firstname.lastname@example.org or call the independent charity Crimestoppers anonymously on 0800 555111.