The two‑day hearing at the Competition Appeal Tribunal will examine whether ministers broke subsidy control rules when they approved a decade‑long financial rescue plan for the publicly owned airport.
The case — filed last summer — argues the subsidy amounts to a taxpayer‑funded advantage that could lure passengers and airlines away from Bristol Airport, which serves around 10 million travellers a year and draws heavily from South Wales.
According to the appeal documents, Bristol Airport claims the Welsh Government’s investment equates to £71.50 per Cardiff Airport passenger, accusing ministers of effectively “paying people to go on holiday”.
The challenge also alleges Cardiff Airport should have been treated as an “ailing or insolvent enterprise”, a legal classification that would have triggered stricter checks before public money could be handed over.
The Welsh Government has repeatedly defended its decision, saying it will “fight for our ability to invest” in the airport’s long‑term future. Ministers argue the funding will support new hangars, maintenance facilities, cargo capacity and new global routes designed to boost Wales’s economy.
But the tribunal filing shows the Competition and Markets Authority’s Subsidy Advice Unit had already raised concerns, recommending more evidence on the subsidy’s proportionality, its impact on competition, and whether the airport could realistically deliver the promised economic benefits.
Welsh Conservatives: “A bottomless pit of taxpayers’ money”
The legal battle has reignited fierce political criticism, with the Welsh Conservatives accusing Labour ministers of pouring public money into a failing airport.
Shadow Transport Secretary Sam Rowlands MS said the case exposed “reckless spending” by the Welsh Government.
“Labour and Plaid Cymru have already sunk more than £200 million of taxpayers’ money into this failing nationalised airport — that’s around £286 per household across Wales,” he said.
“Now, even more public money will be wasted on legal costs to defend this subsidy. People across Wales are rightly asking what they are getting in return.”
Rowlands said the airport should be sold to the private sector “so it can survive, succeed and stop draining taxpayers’ money”.
Andrew RT Davies: “You can throw all the money you like at it…”
Former Welsh Conservative leader Andrew RT Davies MS said ministers must explain what the £205 million handout has actually delivered.
“We all want to see a thriving airport, as it would bring huge benefits to the economy of South Wales,” he said. “But competent leadership is a necessary ingredient to achieving that.”
Davies warned that “a bottomless pit of money” would not fix the airport without strategic direction, pointing to the fact that Qatar Airways — once a flagship long‑haul partner — has still not resumed flights to Cardiff.
“Since they bought Cardiff Airport, Senedd ministers have spent over £400 million of taxpayers’ money on it,” he said. “Given this level of investment, the airport should be in a far better position than it is.”
What happens next?
A panel of three, chaired by barrister Ben Tidswell, will hear Bristol Airport’s appeal against the subsidy and the response of Welsh ministers.
Bristol Airport is asking the tribunal to quash the subsidy, declare it unlawful, and — if necessary — order the Welsh Government to recover any money already handed over.
The Welsh Government said it would present its case “through the proper legal process” and declined to comment further.
The outcome could have major implications not only for Cardiff Airport’s future, but for how devolved governments across the UK support strategic infrastructure.
