Shares in EasyJet , which is the most exposed carrier with UK-France routes accounting for 14% of capacity, dropped by 6.8%. The budget airline made no immediate schedule changes but said customers could cancel for free exchanges or vouchers.
With long-haul traffic flat-lining, Citi analyst Mark Manduca said, the new restrictions hit point-to-point leisure travel that had been viewed with more optimism and dented already fragile confidence in the broader travel sector.
"It's not so much about this summer or even this year, which is a write-off," Manduca said. "It's more about direction of travel, a step in the wrong direction for a market that's trying to recover."
British holidaymakers flocked home early after their government removed France, the Netherlands, Malta, Monaco and two Caribbean territories from a list of unrestricted destinations, with effect from 0300 GMT on Saturday.
Shares in British Airways parent IAG fell 5.7% while Air France-KLM lost 5.6% and Ryanair 5.2%.
The UK move comes a day after airlines lowered their European outlook, with the International Air Transport Association (IATA) predicting a 60% decline in 2020 passenger numbers.
It follows a similar UK decision last month to remove top destination Spain from the so-called safe list. Other countries, including Norway, have also added restrictions as COVID-19 case numbers spike in some areas.
IATA on Friday criticised Britain's "stop-go-stop" approach to travel restrictions, saying it put 780,000 UK jobs at risk.
"The urgent priority is to implement pragmatic alternatives to quarantine," the airline body said on Twitter.
The 14-day quarantine is a major deterrent against UK outbound travel in the latter half of August and September - a period that Olivier Jankovec, head of airports grouping ACI Europe, said is "not insignificant by any means".
Determination to avoid a return to total lockdown is driving tougher travel curbs as well as policy incoherence among governments, Jankovec said.
"Why on earth are we reopening nightclubs and at the same time imposing new travel restrictions?" he added. "You're much safer in an airport or on a plane than in a nightclub."
(Reporting by Laurence Frost; Additional reporting by Sarah Young and Joice Alves in London; Editing by David Goodman)
(Only the headline and picture of this report may have been reworked by the Business Standard staff; the rest of the content is auto-generated from a syndicated feed.)
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