The U.S. travel industry breathed a sigh of relief on Monday after the Biden administration said it would ease longstanding restrictions on international travelers, allowing those who are fully vaccinated against the coronavirus to visit the country beginning in November.

The 18-month travel ban on travelers from Europe, China, Iran, South Africa, Brazil and India has been crippling for the industry, which suffered a $500 billion loss in travel expenditures in 2020, including a 79 percent decease in spending from international travel, according to the U.S. Travel Association, a trade group that promotes travel to and within the country. There were 19.4 million international visitors to the United States in 2020, less than one-quarter of the number who visited in 2019.

Unvaccinated travelers from many countries, including Mexico, Canada and Japan, who have been permitted to travel to the United States before Monday’s announcement will not be allowed in once the new proclamation takes effect.

Roger Dow, the president of the U.S. Travel Association, praised the lifting of the restrictions on vaccinated travelers.

“The U.S. Travel Association applauds the Biden administration’s announcement of a road map to reopen air travel to vaccinated individuals from around the world, which will help revive the American economy and protect public health,” he said in a statement Monday.

“This is a major turning point in the management of the virus and will accelerate the recovery of the millions of travel-related jobs that have been lost due to international travel restrictions.”

Nicholas E. Calio, president of Airlines for America, an industry trade group, also applauded the new policy, which will require airlines to play a role in checking international travelers’ vaccination status. “U.S. airlines have been strong advocates for a stringent, consistent policy and are eager to safely reunite the countless families, friends and colleagues who have not seen each other in nearly two years, if not longer,” Mr. Calio said in a statement.

Willie Walsh, the director general of the International Air Transport Association, a trade group of the world’s airlines, called the new approach to international travel “a step forward” for the U.S. economy, for families separated by previous rules and for managing the spread of coronavirus throughout the world. But there is still much to resolve, he said, given that along with opening up travel for many people to the United States, the new rules also prohibit travel for unvaccinated individuals from across the world.

“The next challenge is finding a system to manage the risks for travelers who do not have access to vaccinations,” he said in a statement. “Data points to testing as a solution. But it is also critical that governments accelerate the global rollout of vaccines and agree on a global framework for travel where testing resources are focused on unvaccinated travelers. We must get back to a situation where the freedom to travel is available to all.”

No city in the United States felt the impact of the travel ban like New York, which had the highest share of overseas travel and drew more than 13.5 million foreign visitors in 2019. International arrivals fell by as much as 93 percent in 2020, according to data from the Port Authority of New York and New Jersey, which runs the area’s airports, among other things.

International visitors generate 50 percent of the city’s tourism spending and 50 percent of hotel room occupancy, NYC & Company, the city’s tourism marketing agency, said. Fred Dixon, the agency’s president and chief executive, welcomed the administration’s decision calling it “a shot in the arm for the industry.”