The Reds made a fruitless seven-hour round trip for the second time in a month, as the first attempt to play the fixture was also halted by fog.
This time, match official Mark Petch had little choice than to abandon plans to play the game around an hour before kick-off as he was unable to see all four corner flags.
It was the third time the game had been postponed after a second attempt to play was thwarted by bad travelling conditions in south Wales.
Photo: Referee Mark Petch looks on as Llanelli boss Andy Legg phones through the bad news.