Hawaii Superferry says it will add a second voyage four days a week between O'ahu and Maui.

The afternoon voyages start May 9.

They are scheduled to leave Honolulu at 3:30 p.m. and arrive in Kahului at 7 p.m.

The return voyages are scheduled to leave Kahului at 8 p.m. and arrive in Honolulu at 11 p.m.

The afternoon voyages will operate on Sundays, Mondays, Wednesdays and Fridays.

The current one-way fare for passengers is $39 and $55 for passenger vehicles for travel through June 5.

"An afternoon voyage will benefit our customers who want the convenience of traveling later in the day," said John Garibaldi, president and CEO of Hawaii Superferry. "This second round-trip voyage will also greatly benefit our commercial customers, offering them the opportunity to return the same day as well as enhancing flexibility in reaching their markets."

The morning voyage will continue its daily summer schedule of departing Honolulu at 6:30 a.m.; arriving in Kahului at 9:30 a.m.; departing Kahului at 11 a.m. and arriving in Honolulu at 2 p.m.

Reservations can be made through www.HawaiiSuperferry.com or through the call center at 1-877-HI-FERRY (877-443-3779). The call center is open daily from 6 a.m. to 7 p.m.