MIAMI—A move by Deutsche Lufthansa AG to charge extra for airfares purchased through travel agents or travel sites like Expedia Inc. has opened a new front in the battle between airlines and their distributors over how customers buy plane tickets.

Lufthansa's €16 ($18) surcharge—the second by a major airline in Europe or the U.S.—is part of a broader push by carriers to direct customers to their websites and away from fare-comparison sites, a trend that the online-travel industry and consumer advocates say will reduce airfare transparency. U.S. discounter Spirit Airlines Inc. already charges $10 extra for fares bought via third parties, and carriers including Delta Air Lines Inc. have pulled fares from some travel sites in recent years.

At a conference this week of the International Air Transport Association, an airline trade group, many airline executives lauded Germany's Lufthansa. In an informal poll of IATA members in the audience at one event, 96 of 118 respondents said their airlines might make a similar move.

The current distribution model "needs to be addressed, and I think what [Lufthansa] has done is a good approach," said Brad Tilden, chief executive of Alaska Air Group Inc.

Currently airlines sell many of their tickets by distributing their fares and schedules to travel agencies via middlemen that charge the carriers for the service. Three companies dominate that middleman role: Sabre Corp., Travelport Worldwide Ltd. and Amadeus IT Group SA.

Airline executives complain that the middlemen charge too much and have impeded change. The middlemen "are struggling with [Lufthansa's move] because it could be the beginning of the end," said Tim Clark, president of Emirates Airline, the world's largest international carrier by traffic. "You didn't do right by the industry," he said of the intermediaries. "You made yourself fat, dumb and happy and we've all suffered as a result, so now there's a big pushback."

The intermediaries argue that they help carriers by distributing fares to wide audiences and help fliers by enabling price comparisons and more booking choices.

Travelport said Lufthansa's proposed surcharge "is not in the interest of either the end-traveler or the airline group," while Sabre said the move "disadvantages consumers and travel agencies" but that "we expect to find a mutually beneficial solution for both Lufthansa and our agency customers."

Svend Olav Leirvaag, Amadeus's vice president of industry affairs, said his company continually invests to improve its technology and predicted that Lufthansa's policy wouldn't pass muster with European regulators—or the market.

"What Lufthansa is doing is contrary to the best interest of the consumer," he said.

Some fliers' groups also criticized Lufthansa's move. The Business Travel Coalition, which represents corporate buyers, said German and European Union antitrust authorities should review Lufthansa's policy as a "possible abuse of its dominant market position." Charlie Leocha, director of the Consumer Travel Alliance, said Lufthansa's move "is a dangerous development for consumers."

Lufthansa Chief Executive Carsten Spohr rejected such criticisms. "There has never been more transparency than we have today about prices," he said.

Mr. Spohr said Lufthansa pays more than $100 million in annual fees to middlemen like Amadeus and it isn't satisfied with their technology. Airlines also say they can better upsell fliers on things like extra-legroom seats when selling on their own sites.

Lufthansa plans to enact its fee in September for all airlines in its group, including Brussels Airlines and Swiss International Air Lines. The company said it chose €16 because it costs €18 to sell a ticket via a middleman versus €2 via its website.

An Amadeus spokesman called those figures "nonsense" but didn't elaborate on the fees it charges Lufthansa.

Airlines are becoming bolder in their fight against distributors because of new technologies to connect directly with customers and improved finances and market positions, said Douglas Quinby of travel-research firm Phocuswright.

Mr. Quinby expects other airlines to wait and see how Lufthansa's policy works, leading to a gradual shift in the industry rather than a sudden revolution.

Air France-KLM SA Chief Executive Alexandre de Juniac said the carrier is exploring a fee similar to Lufthansa's, but that it raises complex technical and legal issues. Most of the airline's sales come via the middlemen, and disrupting that carries risks, he said. The company's contract with the middlemen is valid for two more years, he said, giving it time to watch whether Lufthansa's move is a success.

Write to Jack Nicas at jack.nicas@wsj.com and Robert Wall at robert.wall@wsj.com

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