The company told the BBC that it will stop the Portsmouth to Le Havre route from October 2026.
Meanwhile the Poole to Cherbourg route is due to end in November.
However it said there will be a daily service from Portsmouth to Cherbourg in place of the Poole journey.
Christophe Mathieu, CEO for Brittany Ferries said: "We need adapt and that means a plan to secure a future that will continue to bring opportunities for all those who live and work in the regions we serve."
The company said it faces a bill of €27 million in 2026 and has blamed this on rising taxes, Covid loan repayments, unfair competition and fewer travellers.
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