Deutsche Lufthansa AG's second-quarter profit rebounded sharply even as the airline tries to navigate difficulties in its labor relations and a dispute with the families of survivors from the crash of Germanwings jetliner over compensation.

The German carrier Thursday reported a profit of €529 million ($580 million) compared with €173 million in the year prior, which was hit by several one-time effects. Sales rose 9% to €8.4 billion.

For the first half, Lufthansa swung to a €954 million profit from a €79 million loss in the year-prior. The result was bolstered by the first-quarter disposal of its stake in Jetblue Airways Corp. Second-quarter profit rose to €529 million.

"Our first-half results are solid," Lufthansa Chief Financial Officer Simone Menne said, acknowledging that the improvement was largely due to one-off effects.

Lufthansa has been seeking to revamp its operations and labor agreements to counter discount carriers hurting its short-haul network and strong competition from Middle East airlines that are stealing its long-haul business. Talks with labor unions have been acrimonious and led to strikes, though the carrier's pilots union last week extended an offer for mediation.

Ms. Menne said the airline welcomed the engagement by the pilot's union for further talks, but was still assessing the offer.

Lufthansa also is in a dispute with relatives from the Germanwings plane crash in March over compensation. The relatives charge the airline's compensation offer is inadequate for the loss of life that investigators believe was caused by co-pilot suicide.

Lufthansa confirmed its full-year outlook for at least €1.5 billion in adjusted earnings before interest and taxes, before strike-related costs. Strike costs this year are around €100 million, Ms. Menne said

The absence of some of the one-off effects that aided the first half will largely be absent in the second part of the year, making the period "more demanding," Ms. Menne said. Fuel costs should continue to be lower, she said, though pressure on prices will persist.

The first-half performance benefited from €309 million in lower fuel costs. The strengthening dollar aided sales, though overall it represented a €158 million headwind because Lufthansa has more costs in the U.S. currency than revenue.

Write to Robert Wall at robert.wall@wsj.com

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