PARIS—The seven-day strike by unions representing Air France's flight attendants will cost the Franco-Dutch airline group more than 90 million euros ($101 million), the company said on Tuesday.

Flight attendants at the French arm of Air France-KLM walked out on July 27 until Aug. 2, demanding an expiring labor contract be renewed for a period longer than the 18 months management has offered. Contract talks are expected to resume later this month.

The company on Tuesday said it had canceled 1,400 flights, though 80% of short- and medium-haul flights were maintained, as were 90% of long-haul flights.

In 2015, Air France-KLM managed to post a net profit after losing money for eight years. The turnaround mainly reflected falling fuel prices and cost reductions.

This latest strike was the second this year, after pilots walked out between June 11-14 to protest a management plan to make them fly more for lower hourly pay. The company in that case postponed implementation of the plan regarding the pilots, pending continuing negotiations. That strike had cost the company around €40 million.

Write to Inti Landauro at inti.landauro@wsj.com

(END) Dow Jones Newswires

August 02, 2016 14:45 ET (18:45 GMT)

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