Union leaders for Air Canada’s flight attendants said members would return to work after a deal was reached to end a three-day strike that grounded hundreds of flights, hitting around 500,000 customers.

Air Canada has reached an agreement with the union representing more than 10,000 flight attendants and cabin crew to end a pay strike that has disrupted peak summer travel.

Jobs Minister Patty Hajdu had urged both sides to consider government mediation and raised pressure on Air Canada, promising to investigate allegations of unpaid work in the airline sector, a key com...