The phrase "a difficult voyage" is correct and usable in written English.
It can be used to describe a challenging journey, whether literal or metaphorical, often implying struggles or hardships encountered along the way.
Example: "The explorers faced a difficult voyage across the treacherous seas, battling storms and exhaustion."
Alternatives: "a challenging journey" or "a tough expedition."
"This trial has been a difficult voyage for all of us, and it was a difficult voyage because it was a difficult case," Brafman said.
By any historical or stylistic measure that's a vast distance, and it's a difficult voyage to make with any coherence.
Even though they faced a difficult voyage and knew little about their destination, many signed up to go on the long journey.
Carpathia arrived at Pier 34 in New York on the evening of 18 April after a difficult voyage through pack ice, fog, thunderstorms and rough seas.
This unit was designated No. 1 Mobile Works Squadron (Special Works Force), and arrived at Port Moresby on 7 August after a difficult voyage during which the ship carrying it from Australia it ran aground twice.
According to Newport Beach & Co., after graduating from USC, he crewed a vessel on a difficult voyage to Tahiti.
After a difficult sea voyage, he died in India not long after arriving there in 1805.
The chief of Indian Space Research Organisation (Isro) K Radhakrishnan congratulated his scientists for the orbiter's launch but said a "long and difficult voyage has just begun", the report added.
The fleet had a difficult outbound voyage, suffering from bad weather, accidents and skirmishes with pirates.
On a difficult return voyage in 1788 89 she became separated from her convoy, was taken eastward around the world instead of west and drifted helplessly off Rio de Janeiro for a day while her crew was incapacitated with scurvy.
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