Foreign holidays are currently banned in the UK. Under the government's four-stage roadmap for easing pandemic restrictions, they could be allowed to resume from May 17 at the earliest, although it could be later than that.
"My advice would be to anybody right now is just to hold off on booking international travel," social care minister Helen Whately told the BBC on Monday.
"It just feels premature to be booking international holidays at the moment."
Europe's airlines and travel sector are now bracing for a second lost summer, with rebound hopes increasingly challenged by Europe's slow and chaotic COVID-19 vaccine rollout.
Shares in British Airways-owner IAG, easyJet , TUI and Jet2 all traded down around 6-7% on Monday, paring some of the strong gains since February 22 when Britain announced its ambition to restart travel.
While half of all adults in Britain have received at least one dose of a COVID-19 vaccine, growing infection levels in France, Italy and Germany, fuelled by variants, means the UK may choose to restrict travel beyond the May 17 date.
Whately's comments were the latest in a series of warnings from scientists, public health experts and politicians in recent days.
A second summer of restricted travel will place airlines and travel companies under renewed financial strain, after they've taken on huge debts to survive the last 12 months of lockdowns and holiday bans.
Citi analyst Mark Manduca said he detected a "heightened level of fatigue amongst fundamental investors" whose recovery hopes had propelled a recent rebound in airline stocks.
"The upside momentum-driven express train of all things recovery is now beginning to peter out and falter," he said.
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Strange that the Spanish are welcoming the French and Germans whose virus rates are on the increase and where certain parts of their countries are in lockdown but the Brits are not welcome despite their rates decreasing. Not only that but a significant number of Brits already had the jab whereas much lower rates in other countries due to their arguing what ages can have what vaccine.