How long is the ferry from Aomori to Muroran?

6¾ hours with Tsugaru Kaikyo Ferry, the only company sailing it.

Aomori to Muroran Ferry: 6h 45m, every day

Seats and cabins: Premium seats · Shared rooms · Premium cabins · Suites
Facilities: Shop · Outdoor deck · Spa · Wheelchair access
Pets: Pet cabins · Kennels · Pet area · Dogs travel only in the ships' dog rooms, booked ahead, in a closed cage of up to 44×61×51 cm and up to 20 kg (30 kg in a private dog room or dog-friendly First room); other pets stay in the car with no access during the crossing, and foot passengers cannot bring pets.
Dogs travel only in the ships' dog rooms, booked ahead, in a closed cage of up to 44×61×51 cm and up to 20 kg (30 kg in a private dog room or dog-friendly First room); other pets stay in the car with no access during the crossing, and foot passengers cannot bring pets.