Susanne Clegg said she had left her house in Sheffield at 09:30 BST, but was still waiting at the coach stop at midday.
She described how two different queues had formed at her stop, and “it all kicked off” between them when only one bus arrived.
“I’ve never seen coach rage before today,” she said.
Edana Guest, from Penistone, said the RHS had advertised coaches as arriving every 15 to 20 minutes, but it was “definitely not happening”.
“The last one was half an hour ago, it’s only one bus, and they’re full when they get here.”
She raised concerns about those with mobility issues being made to stand at the station, and felt the event had not been worth her money – with all-day tickets costing £35.
“I doubt the RHS will care, I can’t imagine we’ll get any kind of refund or anything at all.
“It makes me feel disappointed and angry, but I’ve not come here to be angry, I’ve come to have a nice day looking at gardens – so it’s a pity.”
When she arrived at the show after three and a half hours of travelling, she said there were exhibitions she missed because she did not have time to see them.